The speed of light is generally rounded down to 186,000 miles per second. In exact terms it is 299,792,458 m/s (metres per second – that is equal to 186,287.49 miles per second).

The thermometer was invented in 1607 by Galileo.

Englishman Roger Bacon invented the magnifying glass in 1250.

The air at the summit of Mount Everest, 29,029 feet is only a third as thick as the air at sea level.

The largest dinosaur ever discovered was Seismosaurus who was over 100 feet long and weighed up to 80 tonnes.

Utopia ia a large, smooth lying area of Mars.

On the day that Alexander Graham Bell was buried the entire US telephone system was shut down for 1 minute in tribute.

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