John Arnst

Here's why NASA has different radiation limits for male and female astronauts, and how these limits may change in the near future.

It's an instinctual behavior for cats to seek out confined spaces, such as boxes, bags and baskets — Live Science explains why.

A man who had never taken antibiotics before ended up with a case of mania after taking medication for bacterial pneumonia.

How long could you walk in a straight line? What if the path meandered?

Of all the living animals in the world, these are the ones with the longest arms, relative to body size.

Cannabis has long been called "skunky." Turns out, stinky sulfurous compounds are to blame.

The sun is in its main sequence, but how do scientists know when our nearest star will begin to call it quits?

Some sea creatures have arms, others have tentacles and a few have both. So, what's the difference between these appendages?