Category Archives: human biology

Natural selection in our species during the last two millennia

A question I’m always asked in popular lectures on evolution is this: “Are humans still evolving?” The answer I give is “Yes, but we have good evidence for such evolution in only a handful of traits: evolution of earlier reproductive maturity in females, later menopause, and selection for reduced blood pressure and a few other […]

Race as a “social construct”: trouble in Brazil

As I’ve written somewhere (but can’t remember where), it always amused me that when I wrote an NIH grant application, I had to specify my “race” (black, Pacific Islander, white, Hispanic, etc.), but then, in the instructions, it said something like “These categories are taken to be social constructs only, and are not biological.” That statement […]

The sociological religion of no biological differences between the sexes

As a biologist, I’ve learned that there are two related issues that are taboo for academics to discuss openly. The first is the issue of “races”—or genetic differences between human populations. Cultural anthropologists tell us that races are “social constructs.” Well, there’s a bit of truth in that, insofar as there is no finite number of […]

Natural selection reduces years of schooling among Americans

As I’ve often said, the question I’m always asked after my public lectures on evolution is this: “Are humans still evolving?” And my answer is always the same: “Yes, but the evidence we have for evolution occurring right now involves traits that aren’t that interesting.” When people ask that question, what they really want to know […]

An amazing tale of identical twins (two pairs!) swapped and raised apart

Reader Dorsa Amir called my attention to a story by Susan Dominus in today’s New York Times magazine, “The mixed-up brothers of Bogotá.” It tells a bizarre tale of swapped twins that gives clues about the genetic basis of human behavior. It turns out that two pair of identical twins were born in Colombia at the same time, […]

Guest post: Pulling the Plug on Power Posing

JAC: We met Dorsa Amir a while back when she sent us photographs of the Barbary macaques she worked on in Morocco’s Atlas Mountains (she also sent a photo of her orange tomcat Emerson). She recently called my attention to Amy Cuddy’s popular TED video on “power posing”, as Cuddy’s conclusion about hormones and behavior is relevant to Dorsa’s […]

Sam Harris offers “Lying” for free

In his new post on the tribulations of Jonah Lehrer, Sam Harris has an interesting last sentence: I consistently meet smart, well-intentioned, and otherwise ethical people who do not seem to realize how quickly and needlessly lying can destroy their relationships and reputations. This is why I wrote a short ebook on the subject. Since […]

Amazing video: first human birth visualized by MRI

These videos of a human birth, the first visualized by magnetic resonance imaging, apparently appeared as supplementary material to a paper by Bamberg et al. referenced at bottom. The scan was obviously terminated when the baby’s head emerged so that the machine wouldn’t interfere with removing the infant (see picture below). Supine view: The write-up […]