A large unsightly bony bump around the big toe joint is called a bunion. The main cause of a bunion is congenital, and shoes may have very little to do with the formation of a bunion, but can be an aggravating factor.

The largest recorded earthquake in the United States was a magnitude 9.2 that struck Prince William Sound, Alaska on Good Friday, March 28, 1964.

A bicycle headlight mostly allows others to see you. However, some of the brighter lights do aid night time vision. Most lights range in wattage from 2.4 to 20. Police-department bikes in the United States use a minimum of 15 watts.

While the retina of frogs can detect movement, the retina of humans and other primates cannot.

There is no scientific evidence that the Sasquatch (Bigfoot) exists. But for over 70 years, people have been finding and photographing very large tracks, with a similar shape to a human foot, in remote areas of North America.

After two arduous years of research in the steamy Amazon jungle, English biologist Alfred Russel Wallace devised the theory of evolution before Charles Darwin. But Wallace's crucial evidence disappeared when the ship he was taking back to England in 1852 caught fire and sank.

The ratio of the speed of light in a vacuum to the speed of light in a material is called the refractive index of that material. The refractive index of glass, for example, is about 1.5 (depending on the type of glass), which makes the speed of light about a third slower in glass than in a vacuum.

The first bungee jump in the UK was made by David Kirke on 1st April 1979 from the Clifton Suspension bridge in Bristol.

The risk of the Earth encountering an asteroid large enough to cause worldwide devastation in our lifetime is roughly the same as the average person being killed in an air crash, or about 1 in 10,000.