Gray, or Grey, any color formed by blending black and white. Gray tones range from nearly white to nearly black. The many tiny dots of black and white in a halftone reproduction of a photograph produce gray tones.
Magnets are used in all kinds of applications, but do you ever wonder exactly why it sticks to certain metals? Find out the answer to this and other questions as we explore exactly how magnets work.
On one hand, nuclear power offers a clean energy alternative that decreases fossil fuel dependence. On the other, it summons images of quake-ruptured Japanese power plants belching radioactive steam. What happens in reactors in good times and bad?