Twins occur when two separate eggs are fertilized at the same time, or when a fertilized eggs splits into two. Multiple ...

For generations, Gatorade and similar electrolyte beverages have been helpful tools for athletes seeking a competitive edge.

In 1983 archaeologists excavating a cave in South Africa discovered an unusual femur bone. It belonged to an unspecified ...

Have you looked at the international rankings of the world's happiest countries lately? Measuring a country's subjective levels of happiness has become something of an international sport.

The youngest and most metal-rich stars, such as the Sun, are called Population I. Older stars with fewer metals are Population II. The oldest stars, the very first stars to appear in the Universe, are ...