The major air-polluting industries are iron, steel and cement. See more

No word in the English language rhymes with "month", "orange", "silver" or "purple". See more

An ostrich's eye is bigger than its brain. See more

The vocabulary of the average person consists of 5,000 to 6,000 words. See more

At birth, a panda is smaller than a mouse and weighs about four ounces. See more

A jellyfish is 95 percent water. See more

A cow gives nearly 200,000 glasses of milk in her lifetime. See more

A woodpecker can peck twenty times a second. See more

A typical bed usually houses over 6 billion dust mites. See more

A rat can last longer without water than a camel can. See more

A chameleon's tongue is twice the length of its body. See more

Lightning strikes about 6,000 times per minute on this planet. See more

We know more about the surface of the moon than we do about the bottom of the ocean. See more

There are as many chickens on this planet as humans. See more

If you take a pencil, you can draw a 50 kilometer (31 mile) long line. See more

The animal that lived longest of all was a turtle. It lived to become the respectable age of 188 years. See more