Do wild animals get PTSD?
Many creatures that endure trauma show lasting changes in behavior and physiology. Researchers now believe this may be adaptive behavior
When Greenland was really green
Plant debris buried under a mile of ice suggest a time of higher sea levels
The butterfly countereffect
More rain in Africa means more painted ladies make it to Spain
A possible new source for the galaxy’s elements
One candidate is a fast-spinning star that collapsed and exploded 13 billion years ago
The fish that used GPS
Turns out some sharks know where on Earth they are, thanks to their trusty internal compass