The Darwin Tree of Life Project

ACS Reactions catch up with experts they talked to at the start of the pandemic and ask, "what do we know now that we didn’t back then?"

A new fossil specimen of Vilevolodon diplomylos, an ancient herbivore similar to a flying squirrel, may push the origin of mammals back millions of years earlier than previously thought.

Explore the challenges facing amphibious fish when they leave water and the ingenious ways they survive on land.