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Second hardest substance

Second hardest substance

Boron nitride (BN) is the second hardest substance known to man.




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Copper pollution

Scientists have discovered that copper pollution of the atmosphere occurred about 2500 years ago. This was discovered by analyzing ice cores from Greenland. The pollution was attributed to the Romans who used copper for military purposes and to produce coins.

Longest living cells in the body

The longest living cells in the body are brain cells which can live an entire lifetime.

Largest flying animal

The largest flying animal was the pterosaur which lived 70 million years ago. This reptile had a wing span of 36-39 feet (11-11.9 meters) and weighed 190-250 pounds (86-113.5 kilograms).

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