Our skin makes its coloring from pigments. They are colored pigments. People with dark skin have more of these pigments and those with lighter skin have less of them. This pigment is known as melanin. The main function of melanin is to guard the body from sun rays. That is why, we get tanned when [...]

Paid opinion surveys are a large business on the Internet. 700+ survey makers in the U.S. make thousands of surveys every week. Just one of these, Greenfield Online, paid out over $4.2 million to survey participants in 2007! They pay because they need to get volunteers to participate. They need a large number of them [...]