Although the amount of chemicals in each cigarette is small, it is cumulative - the amount stored in the body increases with each puff of a cigarette. There is a little bit of chemical in each cigarette puff, and there are over 10 puffs per cigarette. Over a year, at one pack of cigarettes a day, a smoker will inhale 73,000 puffs of dangerous chemicals.

Alaska is the most earthquake-prone state and one of the most seismically active regions in the world. Alaska experiences a magnitude 7 earthquake almost every year, and a magnitude 8 or greater earthquake on average every 14 years.

Five mighty F-1 engines, each producing 680,000kg of thrust, were used to power the Saturn V Rocket used for moon landings,

Primitive blue-green algae grow in hot springs near Yellowstone's steaming geysers, defying scientific expectations by enduring and thriving in water temperatures as high as 160 degrees F.

Q is the only letter that does not occur in the names of the states of the U.S.

It was by the molecular clock method that the branching point between chimpanzee and man was shown to be as recent as 5-8 million years ago, rather than 14-16 million years, as had been previously generally accepted.

Oxygen is the most abundant element followed by silicon and then aluminium.

In 1832 the Scottish surgeon Neil Arnott devised water beds as a way of improving patients comfort.

A transit of Venus is like a solar eclipse, but instead of the Moon being in line between the Earth and Sun it is the planet Venus.