Scientists believe that the event leading to the extinction may have been a massive asteroid impact or huge volcanic activity. Events such as these could have blocked out sunlight and significantly changed the Earth's ecology.

Superman The Escape rollercoaster, located in California at Six Flags Magic Mountain, goes from 0 to 100 miles per hour in only 7 seconds.

The thumbnail grows the slowest, the middle nail the fastest, nearly 4 times faster than toenails.

AMAZING FACTS