There are many creative ways to give money to a teenager that are more fun than an envelope. Find out more about these ...

"No one knows when envelopes came to China," Benjamin announced, "but we do know that by 1200 B.C. the Chinese had developed a crude form of paper made from reeds and rice." Presumably they would ...

Excess liquid was removed with filter paper (Whatman #1), the grid was then floated briefly on a drop of water (to wash away phosphate or salt), blotted again on a filer paper and then stained with ...