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Why are identical twins alike? In the late nineteen-seventies, a team of scientists in Minnesota set out to determine how much these similarities arose from genes, rather than environments—from “nature,” rather than “nurture.” Scouring thousands of adoption records and news clips, the researchers gleaned a rare cohort of fifty-six identical twins who had been separated at birth. Reared in different families and different cities, often in vastly dissimilar circumstances, these twins shared only their genomes. Yet on tests designed to measure personality, attitudes, temperaments, and anxieties, they converged astonishingly. Social and political attitudes were powerfully correlated: liberals clustered with liberals, and orthodoxy was twinned with orthodoxy. The same went for religiosity (or its absence), even for the ability to be transported by an aesthetic experience. Two brothers, separated by geographic and economic continents, might be brought to tears by the same Chopin nocturne, as if responding to some subtle, common chord struck by their genomes.

And with the Islamic State’s prolific use of social media, terrorism experts and government agencies continually search for clues in posts and Twitter messages that appear to promote the militants’ cause.A physicist may not seem like an obvious person to study such activity. But for months, Neil Johnson, a physicist at the University of Miami, led a team that created a mathematical model to sift order from the chaotic pro-terrorism online universe.

The reward is that it remains the one kind of time travel that works, where you make a wish and actually become a musketeer in Paris or a used-car salesman in Pennsylvania. That one knows, of course, that the actuality is “fictional” or artificial doesn’t change its reality. The vicarious pleasure of reading is, by the perverse principle of professions, one that is often banished from official discussion, but it remains the core activity.

So: Why should English majors exist? Well, there really are no whys to such things, anymore than there are to why we wear clothes or paint good pictures or live in more than hovels and huts or send flowers to our beloved on their birthday. No sane person proposes or has ever proposed an entirely utilitarian, production-oriented view of human purpose. We cannot merely produce goods and services as efficiently as we can, sell them to each other as cheaply as possible, and die.

“For lie detection to be an adaptive skill, that helps us to avoid liars and befriend truth-tellers, it doesn’t have to be conscious alarm bells. It could be more subtle,” ten Brinke says. “More of a feeling that you don’t really want to lend this person twenty dollars, that you’re not excited to go on a second date with this guy.” Ten Brinke and her colleagues decided to focus their efforts on finding evidence for unconscious lie detection.

I banned laptops in the classroom after it became common practice to carry them to school. When I created my “electronic etiquette policy” (as I call it in my syllabus), I was acting on a gut feeling based on personal experience. I’d always figured that, for the kinds of computer-science and math classes that I generally teach, which can have a significant theoretical component, any advantage that might be gained by having a machine at the ready, or available for the primary goal of taking notes, was negligible at best. We still haven’t made it easy to type notation-laden sentences, so the potential benefits were low. Meanwhile, the temptation for distraction was high. I know that I have a hard time staying on task when the option to check out at any momentary lull is available; I assumed that this must be true for my students, as well. Over time, a wealth of studies on students’ use of computers in the classroom has accumulated to support this intuition. Among the most famous is a landmark Cornell University study from 2003 called “The Laptop and the Lecture,” wherein half of a class was allowed unfettered access to their computers during a lecture while the other half was asked to keep their laptops closed. The experiment showed that, regardless of the kind or duration of the computer use, the disconnected students performed better on a post-lecture quiz. The message of the study aligns pretty well with the evidence that multitasking degrades task performance across the board.

WHERE does creativity come from? For centuries, we’ve had a clear answer: the lone genius. The idea of the solitary creator is such a common feature of our cultural landscape (as with Newton and the falling apple) that we easily forget it’s an idea in the first place.But the lone genius is a myth that has outlived its usefulness. Fortunately, a more truthful model is emerging: the creative network, as with the crowd-sourced Wikipedia or the writer’s room at “The Daily Show” or — the real heart of creativity — the intimate exchange of the creative pair, such as John Lennon and Paul McCartney and myriad other examples with which we’ve yet to fully reckon.

The pair is the primary creative unit — not just because pairs produce such a staggering amount of work but also because they help us to grasp the concept of dialectical exchange. At its heart, the creative process itself is about a push and pull between two entities, two cultures or traditions, or two people, or even a single person and the voice inside her head.

he poem “Shirt,” by Robert Pinsky, first appeared in the pages of The New Yorker in 1989. In it, the speaker merges descriptions of garment manufacturing with the social and personal histories of the workers who create the items he buys and wears.

First, the greed: invasion and theft. The Romans invaded Britain in the 1st Century AD and brought their alphabet; in the 7th Century, the Angles and Saxons took over, along with their language. Starting in the 9th Century, Vikings occupied parts of England and brought some words (including they, displacing the Old English hie). Then the Norman French conquered in 1066 – and replaced much of the vocabulary with French, including words which over time became beef, pork, invade, tongue and person.

What could be more exhilarating than experiencing the world through the perspective of another person? In “Remembrance of Things Past,” Marcel Proust’s narrator says that the only true voyage of discovery is not to visit other lands but “to possess other eyes, to behold the universe through the eyes of another, of a hundred others, to behold the hundred universes that each of them beholds.” This is one of the central projects of the humanities; it’s certainly part of the pleasure we get from art and literature.

David McRaney explores the sunk cost fallacy, a strangely twisted bit of logic that seems to pop into the human mind once a person has experienced the pain of loss or the ickiness of waste on his or her way toward a concrete goal. It’s illogical, irrational, unreasonable - and as a perfectly normal human being, you act under its influence all the time.

Documents such as medal and grave records, census information, family photographs and battalion diary entries record their lives, but the IWM says it is still seeking more details about them. The project, which is free to use, is being supported by DC Thomson Family History, which runs several online ancestry websites. Each person in the archive will have their own web page, where the public can upload photographs, write stories and recollections or add links to other records. The IWM says the centenary of WW1 will see many families showing a renewed interest in documents, diaries, letters or photographs handed down by relatives or picked up from museums, libraries and archives.