Did you know what the hardest know substance know to man is?

Did you know what the hardest know substance know to man is?

According to an old English system of time units, a moment is one and a half minutes.

The typewriter was invented in 1829, and the automatic dishwasher in 1889.

The wristwatch was invented in 1904 by Louis Cartier.

When glass breaks, the cracks move at speeds of up to 3,000 miles per hour.

By raising your legs slowly and laying on your back, you can't sink in quicksand.

Ten minutes of one hurricane contains enough energy to match the nuclear stockpiles of the world.

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

Diamonds are the hardest substance known to man.

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

When hydrogen burns in the air, water is formed.