Most people expect nightfall to arrive at some point in the day. In one remote corner of Alaska, that simply stops happening ...

On nighttime excursions in dark-sky hot spots like Norway, New Zealand and Nevada, all you have to do is relax and look up.

It’s highly relevant because muscles have high energy demands,” Cornell’s Martha Field said. “This is the first study that ...

From the adorable aardvark to the mysterious aye-aye, here are 22 animals starting with 'a' ...