Earth's Seasons

While residents of the northern half of the Earth prepare for shorter days and colder weather — the first day of fall is Friday (Sept. 22) — there is a sky spectacle to enjoy.

X-ray scanners and high-speed video captured views of trap-jaw ants' jaws in action — inside and out.  

Before you take a dip, know this: There is definitely pee in the swimming pool. But, it's probably not that much.

This spring, Brood VI periodical cicadas make their first appearance in 17 years.

By mid-February in the three great hot and dry deserts of the American West, wildflowers turn stark desert landscapes into a sea of color.

What can NASA satellites tell us about the spring equinox?

Testing to see if someone peed in the pool just got a little bit sweeter: Scientists in Canada have developed a new way to test for urine, and it involves measuring how sweet the water is.

It may still be February, but spring-like temperatures in most of the United States are making people shed their winter coats unseasonably soon. So what's behind this warm weather?

The famous weather prognosticator, a pudgy groundhog, has crawled out of its burrow on Gobbler's Knob to reveal whether an early spring is on its way.