A healthy person has 6,000 million, million, million haemoglobin molecules.

An individual blood cell takes about 60 seconds to make a complete circuit of the body.

Light would take 0.13 seconds to travel around the Earth.

The dinosaurs became extinct before the Rockies or the Alps were formed.

The largest desert in the world, the Sahara, is 3,500,000 square miles.

The African Elephant gestates for 22 months.

Every year over one million earthquakes shake the Earth.

Every hour the Universe expands by a billion miles in all directions.