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Just as the loss of a species decreases the richness of an ecosystem, the addition of new animals could achieve the opposite effect.

National Geographic Society hosted a larger conference to debate the scientific and ethical questions raised by the prospect of “de-extinction.

“De-extinction went from concept to potential reality right before our eyes,

“This may be the biggest attraction and possibly the biggest benefit of de-extinction. It would surely be very cool to see a living woolly mammoth.”

less scientific, if more persuasive, argument was advanced by the ethicist Hank Greely and the law professor Jacob Sherkow, both of Stanford. De-extinction should be pursued, they argued in a paper published in Science, because it would be really

They will replace chunks of band-tailed-pigeon DNA with synthesized chunks of passenger-pigeon DNA, until the cell’s genome matches their working passenger-pigeon genome.

Scientists predict that changes made by human beings to the composition of the atmosphere could kill off a quarter of the planet’s mammal species, a fifth of its reptiles and a sixth of its birds by 2050

This cloning method, called somatic cell nuclear transfer, can be used only on species for which we have cellular material.

There is a shortcut. The genome of a closely related species will have a high proportion of identical DNA, so it can serve as a blueprint, or “scaffold.”

By comparing the fragments of passenger-pigeon DNA with the genomes of similar species, researchers can assemble an approximation of an actual passenger-pigeon genome.

“We’ve framed it in terms of conservation,”

the genome will have to be inscribed into a living cell.

As with any translation, there may be errors of grammar, clumsy phrases and perhaps a few missing passages, but the book will be legible. It should, at least, tell a good story.

MAGE (Multiplex Automated Genome Engineering). MAGE is nicknamed the “evolution machine” because it can introduce the equivalent of millions of years of genetic mutations within minutes

Developmental and behavioral biologists would take over, just in time to answer some difficult questions. Chicks imitate their parents’ behavior. How do you raise a passenger pigeon without parents of its own species? And how do you train band-tailed pigeons to nurture the strange spawn that emerge from their eggs; chicks that, to them, might seem monstrous: an avian Rosemary’s Baby?

For endangered species with tiny populations, scientists would introduce genetic diversity to offset inbreeding.

They will try to alter the birds’ diets, migration habits and environment. The behavior of each subsequent generation will more closely resemble that of their genetic cousins.

“There’s always this fear that somehow, if we do it, we’re going to accidentally make something horrible, because only nature can really do it right. But nature is totally random. Nature makes monsters. Nature makes threats. Many of the things that are most threatening to us are a product of nature. Revive & Restore is not going to tip the balance in any way.”

For species threatened by contagion, an effort would be made to fortify their DNA with genes that make them disease-resistant

This optimistic, soft-focus fantasy of de-extinction, while thrilling to Ben Novak, is disturbing to many conservation biologists, who consider it a threat to their entire discipline and even to the environmental movement.

The first question posed by conservationists addresses the logic of bringing back an animal whose native habitat has disappeared. Why go through all the trouble just to have the animal go extinct all over again?

There is also anxiety about disease

“If you recreate a species genetically and release it, and that genotype is based on a bird from a 100-year-old environment, you probably will increase risk.”

The scientific term for this type of genetic intervention is “facilitated adaptation.”

De-extinction also poses a rhetorical threat to conservation biologists. The specter of extinction has been the conservation movement’s most powerful argument. What if extinction begins to be seen as a temporary inconvenience?

De-extinction suggests that we can technofix our way out of environmental issues generally, and that’s very, very bad.

How will we decide which species to resurrect?

Philip Seddon recently published a 10-point checklist to determine the suitability of any species for revival, taking into account causes of its extinction, possible threats it might face upon resurrection and man’s ability to destroy the species “in the event of unacceptable ecological or socioeconomic impacts.”

But the most visceral argument against de-extinction is animal cruelty.

“Is it fair to do this to these animals?” Shapiro asked. “Is ‘because we feel guilty’ a good-enough reason?” Stewart Brand made a utilitarian counterargument: “We’re going to go through some suffering, because you try a lot of times, and you get ones that don’t take. On the other hand, if you can bring bucardos back, then how many would get to live that would not have gotten to live?”

In “How to Permit Your Mammoth,” published in The Stanford Environmental Law Journal, Norman F. Carlin asks whether revived species should be protected by the Endangered Species Act or regulated as a genetically modified organism.

He concludes that revived species, “as products of human ingenuity,” should be eligible for patenting.

The term “de-extinction” is misleading. Passenger pigeons will not rise from the grave

Our understanding of the passenger pigeon’s behavior derives entirely from historical accounts.

There is no authoritative definition of “species.” The most widely accepted definition describes a group of organisms that can procreate with one another and produce fertile offspring, but there are many exceptions.

Theseus’ ship, therefore, “became a standing example among the philosophers . . . one side holding that the ship remained the same, and the other contending that it was not the same.”

What is coming will go well beyond the resurrection of extinct species. For millenniums, we have customized our environment, our vegetables and our animals, through breeding, fertilization and pollination. Synthetic biology offers far more sophisticated tools. The creation of novel organisms, like new animals, plants and bacteria, will transform human medicine, agriculture, energy production and much else.

I fear we’re facing a crisis in which a chunk of working-class America risks being calcified into an underclass, marked by drugs, despair, family decline, high incarceration rates and a diminishing role of jobs and education as escalators of upward mobility. We need a national conversation about these dimensions of poverty, and maybe Murray can help trigger it. I fear that liberals are too quick to think of inequality as basically about taxes. Yes, our tax system is a disgrace, but poverty is so much deeper and more complex than that.

to blame liberal social policies for the pathologies he examines. Yes, I’ve seen disability programs encourage some people to drop out of the labor force. But there were far greater forces at work, such as the decline in good union jobs.

Eighty percent of the people in my high school cohort dropped out or didn’t pursue college because it used to be possible to earn a solid living at the steel mill, the glove factory or sawmill. That’s what their parents had done. But the glove factory closed, working-class jobs collapsed and unskilled laborers found themselves competing with immigrants. There aren’t ideal solutions, but some evidence suggests that we need more social policy, not less. Early childhood education can support kids being raised by struggling single parents. Treating drug offenders is far cheaper than incarcerating them. A new study finds that a jobs program for newly released prison inmates left them 22 percent less likely to be convicted of another crime. This initiative, by the Center for Employment Opportunities, more than paid for itself: each $1 brought up to $3.85 in benefits.

it should be even more clear now: Facebook owns web media distribution.

The mobile web has exploded. This is due to the falling cost and rising quality of smartphones. Now, both Apple and Google have huge numbers of great apps, and people love them.

a good chunk of what we might have called dark social visits are actually Facebook mobile app visitors in disguise.

beginning last October, Facebook made changes in its algorithm that started pushing massive amounts of traffic to media publishers. In some cases, as at The Atlantic, where I last worked, our Facebook traffic went up triple-digit percentages. Facebook simultaneously also pushed users to like pages from media companies, which drove up the fan-counts at all kinds of media sites. If you see a page with a million followers, there is a 99 percent chance that it got a push from Facebook.

Chief among the non-gaming apps is Facebook. They’ve done a remarkable job building a mobile app that keeps people using it.

when people are going through their news feeds on the Facebook app and they click on a link, it’s as if someone cut and pasted that link into the browser, meaning that the Facebook app and the target website don’t do the normal handshaking that they do on the web. In the desktop scenario, the incoming visitor has a tout that runs ahead to the website and says, “Hey, I’m coming from Facebook.com.” In the mobile app scenario that communication, known as the referrer, does not happen.

Facebook—which every media publisher already knows owns them—actually has a much tighter grip on web traffic than anyone had thought. Which would make their big-footing among publishers that much more interesting. Because they certainly know how much traffic they’re sending to all your favorite websites, even if those websites themselves do not.

Whenever you go to a website, you take along a little profile called a “user agent.” It says what my operating system is and what kind of browser I use, along with some other information.

A story’s shareability is now largely determined by its shareability on Facebook, with all its attendant quirks and feedback loops. We’re all optimizing for Facebook now,

the social networks—by which I mostly mean Facebook—have begun to eat away at the roots of the old ways of sharing on non-commercial platforms.

what people like to do with their phones, en masse, is open up the Facebook app and thumb through their news feeds.

subjects read several sentences. When he tested them 40 minutes later, they could generally remember the sentences word for word. Four days later, though, they were useless at recalling the specific phrasing of the sentences—but still very good at describing the meaning of them.

When you’re an expert in a subject, you can retain new factoids on your favorite topic easily. This only works for the subjects you’re truly passionate about, though

The groups that scored highest on a test of their transactive memory—in other words, the groups where members most relied on each other to recall information—performed better than those who didn't use transactive memory. Transactive groups don’t just remember better: They also analyze problems more deeply, too, developing a better grasp of underlying principles.

Wegner noticed that spouses often divide up memory tasks. The husband knows the in-laws' birthdays and where the spare light bulbs are kept; the wife knows the bank account numbers and how to program the TiVo

Together, they know a lot. Separately, less so.

Wegner suspected this division of labor takes place because we have pretty good "metamemory." We're aware of our mental strengths and limits, and we're good at intuiting the memory abilities of others.

We share the work of remembering, Wegner argued, because it makes us collectively smarter

They were, in a sense, Googling each other.

Transactive memory works best when you have a sense of how your partners' minds work—where they're strong, where they're weak, where their biases lie. I can judge that for people close to me. But it's harder with digital tools, particularly search engines

So humanity has always relied on coping devices to handle the details for us. We’ve long stored knowledge in books, paper, Post-it notes

And as it turns out, this is what we’re doing with Google and Evernote and our other digital tools. We’re treating them like crazily memorious friends who are usually ready at hand. Our “intimate dyad” now includes a silicon brain.

When Sparrow tested the students, the people who knew the computer had saved the information were less likely to personally recall the info than the ones who were told the trivia wouldn't be saved. In other words, if we know a digital tool is going to remember a fact, we're slightly less likely to remember it ourselves

believing that one won't have access to the information in the future enhances memory for the information itself, whereas believing the information was saved externally enhances memory for the fact that the information could be accessed.

Just as we learn through transactive memory who knows what in our families and offices, we are learning what the computer 'knows' and when we should attend to where we have stored information in our computer-based memories,

We’ve stored a huge chunk of what we “know” in people around us for eons. But we rarely recognize this because, well, we prefer our false self-image as isolated, Cartesian brains

We’re dumber and less cognitively nimble if we're not around other people—and, now, other machines.

When humans spew information at us unbidden, it's boorish. When machines do it, it’s enticing.

Though you might assume search engines are mostly used to answer questions, some research has found that up to 40 percent of all queries are acts of remembering. We're trying to refresh the details of something we've previously encountered.

"the thinking processes of the intimate dyad."

We need to develop literacy in these tools the way we teach kids how to spell and write; we need to be skeptical about search firms’ claims of being “impartial” referees of information

And on an individual level, it’s still important to slowly study and deeply retain things, not least because creative thought—those breakthrough ahas—come from deep and often unconscious rumination, your brain mulling over the stuff it has onboard.

you can stop worrying about your iPhone moving your memory outside your head. It moved out a long time ago—yet it’s still all around you.

Whatever the cause, people who seem to have always held more liberal political views — that is, Democrats — have become increasingly likely to embrace “liberal.”

On economic issues, mind you, Americans still call themselves conservative rather than liberal by a wide margin (39 percent to 19 percent). Yet that gap is shrinking, too, and is lower today than at any point since Gallup began keeping track in 1999.

Looking ahead, astronomers found that ISON will pass within a cosmic whisker of the sun, close enough to potentially be ripped apart by the star’s intense gravity.

Unlike previous sungrazing comets, ISON was detected more than a year out, giving researchers at the world's major ground-based telescopes plenty of time to watch its approach to the sun.

. Because sunlight interacts with gas and dust to make comets light up, Meech thinks the best explanation for her team’s data is that ISON’s nucleus contained a buried layer of solid carbon monoxide, a featherweight molecule that rapidly turns to gas when exposed to sunlight.

Because scientists have no data on the comet’s rotation, Knight and Walsh conclude that ISON will probably survive. However, Knight acknowledges that other comets have broken up for no known reason, and he is prepared for surprises.

Earthbound stargazers won’t notice these details, but motivated observers may be able to spot a new object in the predawn sky

studies usually detect only modest effects that merely tend to whittle your chances of succumbing to a particular disease from small to somewhat smaller

The odds that anything useful will survive from any of these studies are poor,” says Ioannidis—dismissing in a breath a good chunk of the research into which we sink about $100 billion a year in the United States alone.

nutritional studies aren’t the worst. Drug studies have the added corruptive force of financial conflict of interest.

Even when the evidence shows that a particular research idea is wrong, if you have thousands of scientists who have invested their careers in it, they’ll continue to publish papers on it,” he says. “It’s like an epidemic, in the sense that they’re infected with these wrong ideas, and they’re spreading it to other researchers through journals.

Nature, the grande dame of science journals, stated in a 2006 editorial, “Scientists understand that peer review per se provides only a minimal assurance of quality, and that the public conception of peer review as a stamp of authentication is far from the truth.

The ultimate protection against research error and bias is supposed to come from the way scientists constantly retest each other’s results—except they don’t. Only the most prominent findings are likely to be put to the test, because there’s likely to be publication payoff in firming up the proof, or contradicting it.

even for medicine’s most influential studies, the evidence sometimes remains surprisingly narrow. Of those 45 super-cited studies that Ioannidis focused on, 11 had never been retested

even when a research error is outed, it typically persists for years or even decades.

much, perhaps even most, of what doctors do has never been formally put to the test in credible studies, given that the need to do so became obvious to the field only in the 1990s

Other meta-research experts have confirmed that similar issues distort research in all fields of science, from physics to economics (where the highly regarded economists J. Bradford DeLong and Kevin Lang once showed how a remarkably consistent paucity of strong evidence in published economics studies made it unlikely that any of them were right

His PLoS Medicine paper is the most downloaded in the journal’s history, and it’s not even Ioannidis’s most-cited work

while his fellow researchers seem to be getting the message, he hasn’t necessarily forced anyone to do a better job. He fears he won’t in the end have done much to improve anyone’s health. “There may not be fierce objections to what I’m saying,” he explains. “But it’s difficult to change the way that everyday doctors, patients, and healthy people think and behave.”

“Usually what happens is that the doctor will ask for a suite of biochemical tests—liver fat, pancreas function, and so on,” she tells me. “The tests could turn up something, but they’re probably irrelevant. Just having a good talk with the patient and getting a close history is much more likely to tell me what’s wrong.” Of course, the doctors have all been trained to order these tests, she notes, and doing so is a lot quicker than a long bedside chat. They’re also trained to ply the patient with whatever drugs might help whack any errant test numbers back into line.

What they’re not trained to do is to go back and look at the research papers that helped make these drugs the standard of care. “When you look the papers up, you often find the drugs didn’t even work better than a placebo. And no one tested how they worked in combination with the other drugs,” she says. “Just taking the patient off everything can improve their health right away.” But not only is checking out the research another time-consuming task, patients often don’t even like it when they’re taken off their drugs, she explains; they find their prescriptions reassuring.

Already feeling that they’re fighting to keep patients from turning to alternative medical treatments such as homeopathy, or misdiagnosing themselves on the Internet, or simply neglecting medical treatment altogether, many researchers and physicians aren’t eager to provide even more reason to be skeptical of what doctors do—not to mention how public disenchantment with medicine could affect research funding.

We could solve much of the wrongness problem, Ioannidis says, if the world simply stopped expecting scientists to be right. That’s because being wrong in science is fine, and even necessary—as long as scientists recognize that they blew it, report their mistake openly instead of disguising it as a success, and then move on to the next thing, until they come up with the very occasional genuine breakthrough

Science is a noble endeavor, but it’s also a low-yield endeavor,” he says. “I’m not sure that more than a very small percentage of medical research is ever likely to lead to major improvements in clinical outcomes and quality of life. We should be very comfortable with that fact.”

It is unethical to deceive patients by prescribing fake treatments, of course. But there is evidence that people with some conditions benefit even if they know they are taking placebos. In a 2014 study that followed 459 migraine attacks in 66 patients, honestly labeled placebos provided significantly more pain relief than no treatment, and were nearly half as effective as the painkiller Maxalt.

With placebo responses in pain so high — and the risks of drugs so severe — why not prescribe a course of “honest” placebos for those who wish to try it, before proceeding, if necessary, to an active drug?

Another option is to employ alternative therapies, which through placebo responses can benefit patients even when there is no physical mode of action.

Taking a placebo painkiller dampens activity in pain-related areas of the brain and spinal cord, and triggers the release of endorphins, the natural pain-relieving chemicals that opioid drugs are designed to mimic. Even when we take a real painkiller, a big chunk of its effect is delivered not by any direct chemical action, but by our expectation that the drug will work. Studies show that widely used painkillers like morphine, buprenorphine and tramadol are markedly less effective if we don’t know we’re taking them.

Individual attitudes and experiences are important, as are cultural factors. Placebo effects are getting stronger in the United States, for example, though not elsewhere.

Likely explanations include a growing cultural belief in the effectiveness of painkillers — a result of direct-to-consumer advertising (illegal in most other countries) and perhaps the fact that so many Americans have taken these drugs in the past.

Trials show, for example, that strengthening patients’ positive expectations and reducing their anxiety during a variety of procedures, including minimally invasive surgery, while still being honest, can reduce the dose of painkillers required and cut complications.

Placebo studies also reveal the value of social interaction as a treatment for pain. Harvard researchers studied patients in pain from irritable bowel syndrome and found that 44 percent of those given sham acupuncture had adequate relief from their symptoms. If the person who performed the acupuncture was extra supportive and empathetic, however, that figure jumped to 62 percent.

Placebos tell us that pain is a complex mix of biological, psychological and social factors. We need to develop better drugs to treat it, but let’s also take more seriously the idea of relieving pain without them.

But the truth is more nuanced, and, statistically at least, the question of how burdensome student debt is and the extent to which it is disrupting major life events depends on a number of factors, including when you graduated from college with debt.

For those who graduated with debt as the economy was crashing, it was a double-whammy, said Keys, “so you’re seeing delayed marriage, delayed child-bearing, which are at least in part a function of the ongoing damage from the Great Recession.

Before the Great Recession, student debt levels were below auto loans, credit card debt and home-equity lines of credit in the ranking of household debt. Since then, student loan debt has surpassed these other debts

A $1,000 increase in student loan debt lowers the homeownership rate by about 1.5 percentage points for public four-year college-goers during their mid 20s, equivalent to an average delay of 2.5 months in attaining homeownership,

Individuals who attain higher education average higher salaries, which translates into a higher tax base. With higher levels of education attainment, there is also less reliance on social welfare programs, as individuals who attain higher education are more likely to be employed, less likely to be unemployed, and less likely to be in poverty. Higher levels of education are also associated with greater civic engagement, as well as lower crime.”

In 2014, the largest chunk of student debt — nearly 40% — belonged to people owing between $1 and $10,000.

The bigger problem, Webber said, comes when students take out loans and then don’t graduate from college

Nationally, 60% of people who start at a four-year institution wind up graduating within the next six years

There are other ways in which all debt is not created equal. “Many of the people who have the largest loans and are the most likely to default are also the people who got the worst credentials and poorest quality training when they graduated or potentially didn’t even graduate

But although $1.5 trillion is a big number, it may not be an unreasonable amount given the value it is creating

In 2002, a bachelor’s degree holder could expect to make 75% more than someone with just a high school diploma, and nearly a decade later that premium had risen to 84%

A bachelor’s degree is worth about $2.8 million over a lifetime, the study also found.

Australia has a system that links the repayment of loans with the tax system. “Income-driven repayment options have been created in the U.S.,” said Perna, “but these options are more cumbersome and administratively complex than in Australia and some other nations. By linking the amount of the monthly payment to an individual’s income, income-driven repayment options can help to protect borrowers against the risk of non-repayment. But a more seamless system wouldn’t require borrowers to annually report their income to the U.S. Department of Education

“Promise” or “free tuition” programs cropping up in some states are also worth examining

“Right now there is, frankly, very little accountability that schools have; they practically have no skin in the game. If students default on their loans, there is no bad effect for the school.”

Fox sources say that some viewers have sampled Newsmax, yes, but many have just chosen to turn off the news altogether. They're watching Hallmark, HGTV or Netflix instead.

Confusion is certainly apparent among many conservative media producers and commentators -- trying to find their footing as the story of the Capitol assault, and the President's reaction, keeps getting worse."

Fox is focusing on what it calls "Big Tech censorship" instead, but I strongly suspect that most people want news about the terror threat right now, not Twitter. Frankly, many Fox shows are running away from the news rather than reporting on it.

Second: Fox's decision to de-emphasize the news division "in favor of more opinion programming." Third: The opinion shows going "all-in on conspiracies.

Many streets are also being closed off, including the Memorial Bridge that runs from the Lincoln Memorial in D.C. across the Potomac River to Arlington National Cemetery in Virginia.

The National Park Service began a "temporary public closure" of the National Mall

Once a security perimeter is fully in place, any vehicle that enters will have to do so through a checkpoint, where it will be "searched for explosives, weapons and other prohibited items,"

Bowser acknowledged that while she agrees that the security measures, including a new fence around the Capitol complex, are necessary and prudent, she isn't happy that large chunks of her city now look like militarized zones.

The National Guard did not have a representative at the briefing. When asked what Guard members' rules of engagement will be, Miller of the Secret Service said the National Guard is "printing rules of engagement cards for each of its soldiers deployed on this exercise."

rich background knowledge means that you will rarely need to reread a text in an effort to consciously search for connections in the text

I learned something more useful: the existence of non-fiction literature that can teach you anything.

something felt odd. Whenever a conversation revolved around a serious non-fiction book I read, such as ‘Sapiens’ or ‘Thinking Fast and Slow,’ I could never remember much. Turns out, I hadn’t absorbed as much information as I’d believed. Since I couldn’t remember much, I felt as though reading wasn’t an investment in knowledge but mere entertainment.

When I opened up about my struggles, many others confessed they also can’t remember most of what they read, as if forgetting is a character flaw. But it isn’t.

It’s the way we work with books that’s flawed.

there’s a better way to read. Most people rely on techniques like highlighting, rereading, or, worst of all, completely passive reading, which are highly ineffective.

Since I started applying evidence-based learning strategies to reading non-fiction books, many things have changed. I can explain complex ideas during dinner conversations. I can recall interesting concepts and link them in my writing or podcasts. As a result, people come to me for all kinds of advice.

What’s the Architecture of Human Learning and Memory?

Human brains don’t work like recording devices. We don’t absorb information and knowledge by reading sentences.

we store new information in terms of its meaning to our existing memory

we give new information meaning by actively participating in the learning process — we interpret, connect, interrelate, or elaborate

To remember new information, we not only need to know it but also to know how it relates to what we already know.

Learning is dependent on memory processes because previously-stored knowledge functions as a framework in which newly learned information can be linked.”

Human memory works in three stages: acquisition, retention, and retrieval. In the acquisition phase, we link new information to existing knowledge; in the retention phase, we store it, and in the retrieval phase, we get information out of our memory.

Retrieval, the third stage, is cue dependent. This means the more mental links you’re generating during stage one, the acquisition phase, the easier you can access and use your knowledge.

we need to understand that the three phases interrelate

creating durable and flexible access to to-be-learned information is partly a matter of achieving a meaningful encoding of that information and partly a matter of exercising the retrieval process.”

Next, we’ll look at the learning strategies that work best for our brains (elaboration, retrieval, spaced repetition, interleaving, self-testing) and see how we can apply those insights to reading non-fiction books.

The strategies that follow are rooted in research from professors of Psychological & Brain Science around Henry Roediger and Mark McDaniel. Both scientists spent ten years bridging the gap between cognitive psychology and education fields. Harvard University Press published their findings in the book ‘Make It Stick.

#1 Elaboration

“Elaboration is the process of giving new material meaning by expressing it in your own words and connecting it with what you already know.”

Why elaboration works: Elaborative rehearsal encodes information into your long-term memory more effectively. The more details and the stronger you connect new knowledge to what you already know, the better because you’ll be generating more cues. And the more cues they have, the easier you can retrieve your knowledge.

How I apply elaboration: Whenever I read an interesting section, I pause and ask myself about the real-life connection and potential application. The process is invisible, and my inner monologues sound like: “This idea reminds me of…, This insight conflicts with…, I don’t really understand how…, ” etc.

For example, when I learned about A/B testing in ‘The Lean Startup,’ I thought about applying this method to my startup. I added a note on the site stating we should try it in user testing next Wednesday. Thereby the book had an immediate application benefit to my life, and I will always remember how the methodology works.

How you can apply elaboration: Elaborate while you read by asking yourself meta-learning questions like “How does this relate to my life? In which situation will I make use of this knowledge? How does it relate to other insights I have on the topic?”

While pausing and asking yourself these questions, you’re generating important memory cues. If you take some notes, don’t transcribe the author’s words but try to summarize, synthesize, and analyze.

#2 Retrieval

With retrieval, you try to recall something you’ve learned in the past from your memory. While retrieval practice can take many forms — take a test, write an essay, do a multiple-choice test, practice with flashcards

the authors of ‘Make It Stick’ state: “While any kind of retrieval practice generally benefits learning, the implication seems to be that where more cognitive effort is required for retrieval, greater retention results.”

Whatever you settle for, be careful not to copy/paste the words from the author. If you don’t do the brain work yourself, you’ll skip the learning benefits of retrieval

Retrieval strengthens your memory and interrupts forgetting and, as other researchers replicate, as a learning event, the act of retrieving information is considerably more potent than is an additional study opportunity, particularly in terms of facilitating long-term recall.

How I apply retrieval: I retrieve a book’s content from my memory by writing a book summary for every book I want to remember. I ask myself questions like: “How would you summarize the book in three sentences? Which concepts do you want to keep in mind or apply? How does the book relate to what you already know?”

I then publish my summaries on Goodreads or write an article about my favorite insights

How you can apply retrieval: You can come up with your own questions or use mine. If you don’t want to publish your summaries in public, you can write a summary into your journal, start a book club, create a private blog, or initiate a WhatsApp group for sharing book summaries.

a few days after we learn something, forgetting sets in

#3 Spaced Repetition

With spaced repetition, you repeat the same piece of information across increasing intervals.

The harder it feels to recall the information, the stronger the learning effect. “Spaced practice, which allows some forgetting to occur between sessions, strengthens both the learning and the cues and routes for fast retrieval,”

Why it works: It might sound counterintuitive, but forgetting is essential for learning. Spacing out practice might feel less productive than rereading a text because you’ll realize what you forgot. Your brain has to work harder to retrieve your knowledge, which is a good indicator of effective learning.

How I apply spaced repetition: After some weeks, I revisit a book and look at the summary questions (see #2). I try to come up with my answer before I look up my actual summary. I can often only remember a fraction of what I wrote and have to look at the rest.

“Knowledge trapped in books neatly stacked is meaningless and powerless until applied for the betterment of life.”

How you can apply spaced repetition: You can revisit your book summary medium of choice and test yourself on what you remember. What were your action points from the book? Have you applied them? If not, what hindered you?

By testing yourself in varying intervals on your book summaries, you’ll strengthen both learning and cues for fast retrieval.

Why interleaving works: Alternate working on different problems feels more difficult as it, again, facilitates forgetting.

How I apply interleaving: I read different books at the same time.

1) Highlight everything you want to remember

#5 Self-Testing

While reading often falsely tricks us into perceived mastery, testing shows us whether we truly mastered the subject at hand. Self-testing helps you identify knowledge gaps and brings weak areas to the light

“It’s better to solve a problem than to memorize a solution.”

Why it works: Self-testing helps you overcome the illusion of knowledge. “One of the best habits a learner can instill in herself is regular self-quizzing to recalibrate her understanding of what she does and does not know.”

How I apply self-testing: I explain the key lessons from non-fiction books I want to remember to others. Thereby, I test whether I really got the concept. Often, I didn’t

instead of feeling frustrated, cognitive science made me realize that identifying knowledge gaps are a desirable and necessary effect for long-term remembering.

How you can apply self-testing: Teaching your lessons learned from a non-fiction book is a great way to test yourself. Before you explain a topic to somebody, you have to combine several mental tasks: filter relevant information, organize this information, and articulate it using your own vocabulary.

Now that I discovered how to use my Kindle as a learning device, I wouldn’t trade it for a paper book anymore. Here are the four steps it takes to enrich your e-reading experience

How you can apply interleaving: Your brain can handle reading different books simultaneously, and it’s effective to do so. You can start a new book before you finish the one you’re reading. Starting again into a topic you partly forgot feels difficult first, but as you know by now, that’s the effect you want to achieve.

it won’t surprise you that researchers proved highlighting to be ineffective. It’s passive and doesn’t create memory cues.

2) Cut down your highlights in your browser

After you finished reading the book, you want to reduce your highlights to the essential part. Visit your Kindle Notes page to find a list of all your highlights. Using your desktop browser is faster and more convenient than editing your highlights on your e-reading device.

Now, browse through your highlights, delete what you no longer need, and add notes to the ones you really like. By adding notes to the highlights, you’ll connect the new information to your existing knowledge

3) Use software to practice spaced repetitionThis part is the main reason for e-books beating printed books. While you can do all of the above with a little extra time on your physical books, there’s no way to systemize your repetition praxis.

Readwise is the best software to combine spaced repetition with your e-books. It’s an online service that connects to your Kindle account and imports all your Kindle highlights. Then, it creates flashcards of your highlights and allows you to export your highlights to your favorite note-taking app.

Common Learning Myths DebunkedWhile reading and studying evidence-based learning techniques I also came across some things I wrongly believed to be true.

#2 Effective learning should feel easyWe think learning works best when it feels productive. That’s why we continue to use ineffective techniques like rereading or highlighting. But learning works best when it feels hard, or as the authors of ‘Make It Stick’ write: “Learning that’s easy is like writing in sand, here today and gone tomorrow.”

In Conclusion

I developed and adjusted these strategies over two years, and they’re still a work in progress.

Try all of them but don’t force yourself through anything that doesn’t feel right for you. I encourage you to do your own research, add further techniques, and skip what doesn’t serve you

“In the case of good books, the point is not to see how many of them you can get through, but rather how many can get through to you.”— Mortimer J. Adler

she captured damselfish from various reefs and put them through a series of challenges. First, she put square plates on either side of their tank. One of these hid a chunk of food that the fish could smell but not reach, while the other hid a more accessible morsel. The damselfish had to learn which plate to swim up to—a simple spatial-memory test, and one that every individual passed. Next, Binning swapped the location of the correct plate; again, all the fish learned to change their behavior.

hings changed when she gave them a more difficult task. This time, they had to approach the correct plate based not on its location, but on its appearance. This skill—visual discrimination—is vitally important to a damselfish. “They have to learn very quickly, on the basis of color and pattern, which fish are safe to be around, and what competitors or friends look like,” says Binning. “They’re very good at that.”

Without the cleaners, the damselfish might also not have enough energy to fully fuel their demanding brains. They’re targeted by parasitic, bloodsucking crustaceans, which makes them “anemic, sluggish, and weak,” Binning says. When cleaners remove these parasites, the distressed damsels can divert their energies toward other matters—like thinking.

The tech leaders question claims by crypto evangelists that “crypto-assets are an innovative technology that is unreservedly good” and instead urge lawmakers to “take a critical, skeptical approach” toward crypto.

digital token bitcoin taking up a $562 billion chunk alone.

The signatories write that “not all innovation is unqualifiedly good” and say that “the history of technology is full of dead ends, false starts, and wrong turns.”