1 - Nuclear Power provides approximately 13-14% of electricity worldwide, and is particularly widely used in the United States, France and Japan.

2 - Proteins are built up from approximately twenty food elements called amino-acids, which are found more abundantly in animal protein than in vegetable protein.

3 - Until the 1980s, most scientists believed that non-catastrophic geological processes caused the extinction of dinosaurs that occurred approximately 66 million years ago, at the end of the Cretaceous period.

4 - Approximately 700 tornadoes a year occur within the Unite States, and this comprises three-quarters of the worldwide total.

5 - An Olympic marathon is 26 miles and 385 yards, approximately the distance from Marathon to Athens.