NORAD, the North American Aerospace Defense Command, tracks Santa's Christmas Eve flight around the world each year. Follow a ...

Step inside the strange world of a superfluid, a liquid that can flow endlessly without friction, defying the common-sense ...

Elysse Bell is a finance and business writer for Investopedia. She writes about small business, personal finance, technology, and more. Erika Rasure is globally-recognized as a leading consumer ...