Brittle nails and slow growth can signal nutritional deficiencies, bad habits, or health issues. Here are some treatment ...

These needle-sharp structures are composed of a transparent, brittle mineral formed from calcium carbonate. They protect the soft bodies of these marine invertebrates, and are key to distinguishing ...

China hits back at U.S. tariffs by restricting export of crucial metals: tungsten, tellurium, bismuth, molybdenum and indium.