A timeless question has always fascinated scientists who study the past. Which comes first, the new behavior or the physical tool that perfects it? Do you change how you live and then evolve the body ...

On a bright, late-summer day in north-central Europe around 300,000 years ago, a team of perhaps a couple dozen hunters got into their assigned positions for a big kill. Little did they know that ...

Why the Latest Science Leads Us to a New Theory of Human Nature, by Jonathan Leaf (Bombardier, 320 pp., $21) Ever since Darwin, biologists have believed that much could be learned about human nature ...

Mild aggression and lethal violence evolved separately, according to research across 100 primate species. The study challenges the idea that everyday conflict leads to deadly outcomes.

Introduction : Why teeth? -- I. Development. Microscopes, cells, and biological rhythms -- The big picture : birth, death, and everything in between -- Things that can go wrong : stress, pathology, ...

Walk into any party and you’ll witness a living galaxy of behavior. Someone is brushing a friend’s hair; a couple leans close in flirtation; a group laughs too loudly over cards; others linger by the ...