President Donald Trump wants to secure a deal with Kiev to ensure the US gets its money back by trading aid for rare-earth ...

Learn how time scales for objects thousands versus millions of years old could be better synchronized.

President Donald Trump came out on Feb. 3 saying he was looking to cut a deal with Ukraine by giving the war-torn country ...

Rubies and emeralds have the colors they do because, like many substances, they absorb some colors of light. Most visible light, like sunlight, is composed of all the colors of the rainbow: red, ...