New evidence suggests that the dawn of speech came before the time of our last common ancestor with Old World monkeys

Different organs peak at different times, producing a steady, 24-hour pattern

Other creatures replay their memories to make assessments, a revelation that has implications for humans, too

How limestone-covered algae sway global climate — and how their fate may shift as the oceans acidify

Flicking the lights on and off can save energy without hurting indoor agriculture harvests Kevin..