They're known as man's best friends, fur babies, pooches. But the most widely used word for these beloved animals — "dog" — is also a great linguistic mystery. "The most everyday, commonplace words ...

Astrolabe, an ancient astronomical tool, helped measure time, direction, and stars. Discover its meaning, origin, and role in ...

Scientific terminology arranged in dictionary form with a full page discussion of the history, root, and meaning of each word.