Learn how cleaner wrasse used a mirror and even dropped food to test their reflections, a behavior linked mostly to mammals.

Soumaya Keynes We’ve all heard of nudge. It’s the idea that by changing the default option, by doing one little tweak, policymakers can nudge individuals towards making better choices. By exploiting ...

Seem too simple a connection? Actually, no. Psychologists call it the spillover effect, the way making one positive choice, ...