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Few things are harder to study than human language. The brains of living humans can only be studied indirectly, and language, unlike vision, has no analogue in the animal world. Vision scientists can study sight in monkeys using techniques like single-neuron recording. But monkeys don’t talk. However, in an article published today in Nature, a group of researchers, including myself, detail a discovery in birdsong that may help lead to a revised understanding of an important aspect of human language development. Almost five years ago, I sent a piece of fan mail to Ofer Tchernichovski, who had just published an article showing that, in just three or four generations, songbirds raised in isolation often developed songs typical of their species. He invited me to visit his lab, a cramped space stuffed with several hundred birds residing in souped-up climate-controlled refrigerators. Dina Lipkind, at the time Tchernichovski’s post-doctoral student, explained a method she had developed for teaching zebra finches two songs. (Ordinarily, a zebra finch learns only one song in its lifetime.) She had discovered that by switching the song of a tutor bird at precisely the right moment, a juvenile bird could learn a second, new song after it had mastered the first one. Thinking about bilingualism and some puzzles I had encountered in my own lab, I suggested that Lipkind’s method could be useful in casting light on the question of how a creature—any creature—learns to put linguistic elements together.

What has more consciousness: a puppy or a baby? An iPhone 5 or an octopus? For a long time, the question seemed impossible to address. But recently, Giulio Tononi, a neuroscientist at the University of Wisconsin, argued that consciousness can be measured—captured in a single value that he calls Φ, the Greek letter phi. The intuition behind Tononi’s idea, known as the Integrated Information Theory, is that we experience consciousness when we integrate different sensory inputs. According to Tononi, when you eat ice cream, you cannot separate the taste of the sugar on your tongue from the sensation of the melting liquid coating the inside your mouth. Phi is a measure of the extent to which a given system—for example, a brain circuit—is capable of fusing these distinctive bits of information. The more distinctive the information, and the more specialized and integrated a system is, the higher its phi. To Tononi, phi directly measures consciousness; the higher your phi, the more conscious you are.

The opposite of that is the hot-hand fallacy — the belief that winning streaks, whether in basketball or coin tossing, have a tendency to continue, as if propelled by their own momentum. Both misconceptions are reflections of the brain’s wired-in rejection of the power that randomness holds over our lives. Look deep enough, we instinctively believe, and we may uncover a hidden order.

A working paper published this summer has caused a stir by proposing that a classic body of research disproving the existence of the hot hand in basketball is flawed by a subtle misperception about randomness. If the analysis is correct, the possibility remains that the hot hand is real.

Taken to extremes, seeing connections that don’t exist can be a symptom of a psychiatric condition called apophenia. In less pathological forms, the brain’s hunger for pattern gives rise to superstitions (astrology, numerology) and is a driving factor in what has been called a replication crisis in science — a growing number of papers that cannot be confirmed by other laboratories.

A team of scientists unveiled a new tree of life on Monday, a diagram outlining the evolution of all living things. The researchers found that bacteria make up most of life’s branches.

So why is grit so important?My lab has found that this measure beats the pants off I.Q., SAT scores, physical fitness and a bazillion other measures to help us know in advance which individuals will be successful in some situations.

Among the defenders of the project, however, is Anne Churchland, a neuroscientist at Cold Spring Harbor Laboratory who studies how people make decisions. In 2001, she started Anne’s List, a directory of 170 women in computational neuroscience, intended to silence claims that no good female scientists existed in that field.Her research suggests that someone you recently had lunch with or someone from your hometown might spring to mind when selecting a speaker, even though neither has anything to do with science.“It doesn’t feel like irrelevant information influences our judgment, but it does,” Dr. Churchland said.

When people are dying and you can only save some, how do you choose? Maybe you save the youngest. Or the sickest. Maybe you even just put all the names in a hat and pick at random. Would your answer change if a sick person was standing right in front of you? In this episode, we follow New York Times reporter Sheri Fink as she searches for the answer. In a warzone, a hurricane, a church basement, and an earthquake, the question remains the same. What happens, what should happen, when humans are forced to play god?

The major finding was that irrationality — or what Professor Stanovich called “dysrationalia” — correlates relatively weakly with I.Q. A person with a high I.Q. is about as likely to suffer from dysrationalia as a person with a low I.Q.

Based on this evidence, Professor Stanovich and colleagues have introduced the concept of the rationality quotient, or R.Q. If an I.Q. test measures something like raw intellectual horsepower (abstract reasoning and verbal ability), a test of R.Q. would measure the propensity for reflective thought — stepping back from your own thinking and correcting its faulty tendencies.

ARE you intelligent — or rational? The question may sound redundant, but in recent years researchers have demonstrated just how distinct those two cognitive attributes actually are.

What attributes make for a successful trader? Is it comprehensive knowledge of an industry? The ability to read the markets? Luck?Or might it be something subtler and seemingly unrelated — namely, an awareness of one’s own heartbeat?

The tribunal that questioned me was not juridical, but ecclesiastical. I was not asked about my faith. (For the record, I’m an atheist.) I was not asked if it was a miracle. I was asked if I could explain it scientifically. I could not, though I had come armed for my testimony with the most up-to-date hematological literature, which showed that long survivals following relapses were not seen.

Occasionally, I come across the term “designer baby,” and I am reminded that some parents now have the option to screen or modify the genes of their unborn children to ensure or avoid certain traits. It always gives me a feeling of unease. Obviously, I did not take this route — partly because, at least with my son, I never had to actually make the decision. My third child, Eliza, was a late midlife accident. I chose to have her despite the possibility she would have XLH, but would I have made the same decision in a planned pregnancy or if given a choice much earlier in the process? I can’t help suspecting that because of advances in genetic mapping, genetic testing, the sheer range of prenatal choices, chances are that in a generation or two, there will be no one in the world who has XLH, no one who looks like me or my children — at least not in the so-called developed world — and I don’t know how to feel about that.

Should public money be spent to preserve these crumbling sites? Is controlled decay an option for anything associated with the Nazis? Or have Hitler and his architect, Albert Speer, locked future generations into a devilish pact that compels Germans not only to teach the history of the Thousand Year Reich the Nazis proclaimed here but also to adapt it for each new era?Several dozen experts — and some curious citizens — gathered for a weekend recently to ponder such questions at a forum titled “Preserve. For what?”

Leah H. Somerville, a Harvard neuroscientist, sometimes finds herself in front of an audience of judges. They come to hear her speak about how the brain develops.It’s a subject on which many legal questions depend. How old does someone have to be to be sentenced to death? When should someone get to vote? Can an 18-year-old give informed consent?

Over the years, he said, many hypotheses about the secret properties of Stradivari and Guarneri instruments have come and gone. Advertisement Continue reading the main story For a while, people suggested that luthiers had simply used trees that have since gone extinct — but in fact those trees still exist. In 2003, Dr. Grissino-Mayer and a colleague said Stradivari’s secret had to do with the fact that he had lived during an extremely cold period, known as the little ice age, and that the trees around him were growing differently. How exactly that may have produced better instruments, however, remains unclear. Another popular theory — that Stradivari was using a varnish with magical sound properties — has not been substantiated by any chemical analyses.

WHEN representatives from the United States and other countries gathered in Evian, France, in 1938 to discuss the Jewish refugee crisis caused by the Nazis, they exuded sympathy for Jews — and excuses about why they couldn’t admit them. Unto the breach stepped a 33-year-old woman from Massachusetts named Martha Sharp.

The spectacular success of science in the past 300 years has raised hopes that it also holds the key to guiding human beings towards a good life. Psychology and neuroscience has become a main source of life advice in the popular media. But philosophers have long held reservations about this scientific orientation to how to live life.