282. Fact

A mosquito has 47 teeth.

283. Fact

Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.

284. Fact

Seventy percent of the dust in your home consists of shed human skin.

285. Fact

Fish are the only vertebrates that outnumber birds.

286. Fact

A cockroach can live for several weeks without its head.

287. Fact

The average human produces a quart of saliva a day -- about 10,000 gallons in a lifetime.

288. Fact

Elephants have been known to remain standing after they die.

289. Fact

The embryos of tiger sharks fight each other while in their mother's womb, the survivor being the baby shark that is born.

290. Fact

Ants do not sleep.

291. Fact

Nearly a third of all bottled drinking water purchased in the us is contaminated with bacteria.

292. Fact

Rats multiply so quickly that in 18 months, two rats could have over 1 million descendents.

293. Fact

An astronaut can be up to 2 inches taller returning from space. The cartilage disks in the spine expand in the absence of gravity.

294. Fact

The oldest known fossil is of a single-celled organism, blue-green algae, found in 3.2 billion year-old stones in south africa.

295. Fact

The oldest multicellular fossils date from ~700 million years ago.

296. Fact

The earliest cockroach fossils are about 280 million years old.

297. Fact

Healthy nails grow about 2 cm each year. Fingernails grow four times as fast as toenails.

298. Fact

20/20 vision means the eye can see normally at 20 feet. 20/15 is better; the eye can see at 20 feet what another eye sees at 15 feet.

299. Fact

The average person has 100,000 hairs on his/her head. Each hair grows about 5 inches (12.7 cm) every year.

300. Fact

There are 60,000 miles (97,000 km) in blood vessels in every human.

301. Fact

Antipodes
A region or place on the opposite side of a point on the earth.

Fact
The first telephone book ever issued contained only fifty names. It was published in New Haven, Connecticut, by the New Haven District Telephone Company in February, 1878.      .. More >>