Why is Friday the 13th considered unlucky, anyway? Humans have long used superstitions as a way of explaining everyday ...

A prehistoric map of the night sky has been discovered on the walls of the famous painted caves at Lascaux in central France. It is a map of the prehistoric cosmos According to Dr Rappenglueck, these ...

Ask the publishers to restore access to 500,000+ books. An icon used to represent a menu that can be toggled by interacting with this icon. A line drawing of the Internet Archive headquarters building ...