The Pony Express began April 3, 1860.

The Arabian Peninsula is the largest peninsula in the world.

Horses have padded cushions on the bottom of their feet called frogs.

Fully-grown male hippopotamuses can grow up to be 12 feet long.

The Israelites were released from Babylon by Cyrus the Great.

The giant panda's diet is 99% bamboo (it eats only a small amount of meat.)

Cats are the second most popular pet.

The American Kennel Club recognizes 140 breeds of purebred dogs.

The Dead Sea is the lowest place on the earth's land surface.

The poem "Mary Had a Little Lamb," is believed by most to be written by Sarah Hale, while others believe that a man named John Roulstone wrote it.

The aggressive red squirrel is often called the chickaree.

In the 1300s through the 1600s, the bubonic plague swept through Europe, killing over 60 million people.

Platypuses and echidnas are the only mammals that lay eggs.

Blue whales are approximately 100 feet long.

Hiram Maxim, the American who invented the machine gun, also created a steam-powered flying machine. However, unlike the machine gun, the flying machine was a failure.

King Ur-Nammu ruled in Ur, Sumer, in the year 2100 B.C.

While some think that goldenrod causes hay fever, the true culprit is ragweed.

The Sumerians invented the wheel and writing.

The Tigris River in the Fertile Crescent is believed by some to be the Hiddekel River mentioned in Genesis.

Beetles make up 1 quarter of all the animals in the world.