182. Fact

Most gemstones contain several elements. The exception? The diamond. It's all carbon.

183. Fact

Diamonds are the hardest substance known to man.

184. Fact

Which of the 50 states has never had an earthquake? North dakota.

185. Fact

When hydrogen burns in the air, water is formed.

186. Fact

Sterling silver contains 7.5% copper.

187. Fact

Cars were first made with ignition keys in 1949.

188. Fact

J.b dunlop was first to put air into tires.

189. Fact

Alexander graham bell, who invented the telephone, also set a world water-speed record of over seventy miles an hour at the age of seventy two.

190. Fact

It is energy-efficient to turn off a fluorescent light only if it will not be used again within an hour or more. This is because of the high voltage needed to turn it on, and the shortened life this high voltage causes.

191. Fact

The earth's equatorial circumference (40,075 km) is greater than its polar circumference (40,008 km).

192. Fact

Lake baikal is the deepest lake in the world.

193. Fact

Due to gravitational effects, you weigh slightly less when the moon is directly overhead.

194. Fact

The earth's average velocity orbiting the sun is 107,220 km per hour.

195. Fact

There is a high and low tide because of our moon and the sun.

196. Fact

The united states consumes 25% of all the worlds energy.

197. Fact

Flying from london to new york by concord, due to the time zones crossed, you can arrive 2 hours before you leave.

198. Fact

There is enough fuel in a full tank of a jumbo jet to drive an average car four times around the world.

199. Fact

The surface speed record on the moon is 10.56 miles per hour. It was set with the lunar rover.

200. Fact

If you could drive to the sun -- at 55 miles per hour -- it would take about 193 years.

201. Fact

The moon is one million times drier than the gobi desert.

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