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.

The seventeenth president of the United States, Andrew Johnson did not know how to read until he was 17 years old.

Playwright Shakespeare was only 18 years old when he married Ann Hathaway, who was 26 years old at the time.

AMAZING FACTS