It’s not known how many federal probationary status employees were terminated and how many have returned to the job.

Explore Mammoth Cave National Park, the longest cave system on Earth, featuring the richest known habitat for cave wildlife in the world. It may be difficult to think of caves as spacious and grand, ...

What kind of creatures were kicking about in the oceans 340 million years ago? We’ve now got a slightly clearer picture thanks to the discovery of a small but mighty ancient shark species found ...