271. Fact

A crocodiles tongue is attached to the roof of its mouth.

272. Fact

Crocodiles swallow stones to help them dive deeper.

273. Fact

Giraffes are unable to cough.

274. Fact

Sharks are immune to cancer.

275. Fact

Despite the hump, a camels spine is straight.

276. Fact

Cheetah's can accelerate from 0 to 70 km/h in 3 seconds.

277. Fact

A giraffe's neck contains the same number of vertebrae as a human.

278. Fact

The heart of giraffe is two feet long, and can weigh as much as twenty four pounds.

279. Fact

On average, elephants sleep for about 2 hours per day.

280. Fact

Lobsters have blue blood.

281. Fact

Shark's teeth are literally as hard as steel.

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.

302. Fact

Anticyclones
Winds which blow outward from the center.

303. Fact

Aphelion
Position of the earth in its orbit when is at the maximum distance from the sun.

304. Fact

Archipelago
A cluster of islands, e.g., pearl islands in the gulf of panama.

305. Fact

Atoll
Coral reef resembling a horse shoe, enclosing a lagoon.

306. Fact

Axis
An imaginary line joining north and south poles.

307. Fact

Avalanche
A vast mass of snow mixed with earth or stones.

308. Fact

Biosphere
Animate or inanimate organic kingdom on earth.

309. Fact

Canyon
A deep valley cut by a river through a mountain region, e,g., the grand canyon of the colarado river in the usa.

310. Fact

Continental shelf
Land adjoining a continent submerged in the sea.

311. Fact

Cyclones
A low pressure system area in which the wind blows spirally inward.

312. Fact

Crop rotation
Growing different crops needing different minerals for their growth in the same piece of land in order to get more yield.

313. Fact

Date line
An imaginary line pointing north-south approximating to the meridian 180 (east or west) where the date changes by one day the moment it is crossed.

314. Fact

Delta
Alluvial deposit shaped like greek letter, formed at the mouth of the river, where it falls into the sea, e.g., the sunderban delta.

315. Fact

Dew
Condensed atmospheric water vapours due to the cooling of the air.

316. Fact

Dry farming
Growing of crops in low rainfall areas by moisture conservation, crop rotation but without irrigation.

317. Fact

Equator
An imaginary line dividing the earth into two equal parts.

318. Fact

Equinoxes
The day on which nights and days are of equal duration, e.g., march 22 and september 23.

319. Fact

Erosion
Wearing away of the earth's land surface by rain, wind, water, etc. Rendering the land infertile.

320. Fact

Eclipse
When one earthly body obscures another one partially or completely.

Fact
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