A yellow band across a wing might look like a simple flourish. In the South American rainforest, it can mean survival.

How do cells know what they should become as the body develops? Biological development depends crucially on spatial patterns: the lines that eventually give rise to segments, organs, or markings like ...

Scientists have shown that evolution has been using the same genetic "cheat sheet" for over 120 million years, suggesting ...

This volume is based on the National Academy of Sciences' Colloquium on the Tempo and Mode of Evolution. The articles appearing in these pages were contributed by speakers at the colloquium and have ...