In 1971, the postal code was introduced in Ottawa, Ontario.

The average lead pencil will draw a line 35 miles long or write approximately 50,000 English words. More than 2 billion pencils are manufactured each year in the United States. If these were laid end to end they would circle the world nine times.

In the Durango desert, in Mexico, there's a creepy spot called the "Zone of Silence." You can't pick up clear TV or radio signals. And locals say fireballs sometimes appear in the sky.

AMAZING FACTS