Some dolphin species face the threat of extinction, often directly as a result of human behavior. The Yangtze River Dolphin is an example of a dolphin species which may have recently become extinct.

Dentists have recommended that a toothbrush be kept at least 6 feet (2 m) away from a toilet to avoid airborne particles resulting from the flush.

Footprints of astronauts who landed on the moon should last at least 10 million years since the moon has no atmosphere.

AMAZING FACTS