Although frogs live on land their habitat must be near swamps, ponds or in a damp place. This is because they will die if their skin dries out.

If a shark was put into a large swimming pool, it would be able to smell a single drop of blood in the water.

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

AMAZING FACTS