The quaking aspen (Populus tremuloides) is one of Colorado’s most iconic trees and maybe its most dramatic. With smooth white ...

Have any modern animals adapted to human activity through natural selection? Illustration by Hokyoung Kim Q: Have any modern animals adapted to human activity through natural selection? Mike ...

Question: We have had lots of smoky air in Minnesota the past few summers from wildfires. Why is it so much worse? Answer: As ...