Drinking water after eating reduces the acid in your mouth by 61 percent.

The American forest products industry provides jobs for one and a half million Americans and contributes more than $200 billion to the national economy.

A Boeing jet plane weighs about 900,000 pounds.

Ten radishes contain only eight calories.

In the 1800s there were reports of canals on Mars but they have since been discredited.

In the absence of an adequate fossil record, it used to be nearly impossible to determine the geological age of many evolutionary lineages. However, Zuckerkandl and Pauling (1962) showed that many molecules change constantly over time. Such molecules can serve as a molecular clock.

A perfectly clean fire produces almost no smoke. Smoke simply means that a fire is not burning properly and that bits of unburned material are escaping.

Radio-controlled (atomic) time was invented by scientists at the National Institute of Standards & Technology, an agency of the U.S Department of Commerce.

Quasars are the most distant objects in the known universe.