Fact

E-Mail

The first e-mail was sent over the Internet in 1972.

Eye Glasses

The Chinese invented eyeglasses. Marco Polo reported seeing many pairs worn by the Chinese as early as

1275, 500 years before lens grinding became an art in the West.

Glass

If hot water is suddenly poured into a glass that glass is more apt to break if it is thick than if it is thin. This is

why test tubes are made of thin glass.

Hard Hats

Construction workers hard hats were first invented and used in the building of the Hoover Dam in 1933.

Hoover Dam

The Hoover Dam was built to last 2,000 years. The concrete in it will not even be fully cured for another 500

years.

Limelight

Limelight was how we lit the stage before electricity was invented. Basically, illumination was produced by

heating blocks of lime until they glowed.

Mobile (Cellular) Phones

As much as 80% of microwaves from mobile phones are absorbed by your head.

Nuclear Power

Nuclear ships are basically steamships and driven by steam turbines. The reactor just develops heat to boil

the water.

Oil

The amount of oil that is used worldwide in one year is doubling every ten years. If that rate of increase

continues and if the world were nothing but oil, all the oil would be used up in 400 years.

Radio Waves

Radio waves travel so much faster than sound waves that a broadcast voice can be heard sooner 18,000 km

away than in the back of the room in which it originated.

Rickshaw

The rickshaw was invented by the Reverend Jonathan Scobie, an American Baptist minister living in

Yokohama, Japan, built the first model in 1869 in order to transport his invalid wife. Today it remains a

common mode of transportation in the Orient.