Peter L. Falkingham and his colleagues at Manchester University are developing techniques that...

The most difficult aspect of money to understand is its function as a unit of account. In...

In the deserts, as elsewhere, rocks at the earth's surface are changed by weathering, which...

The first zoo in the United States opened in Philadelphia in 1874, followed by the Cincinnati...

Such is our dependence on fossil fuels, and such is the volume of carbon dioxide we have...

The circulation of air in the atmosphere is activated by convection, the transference of heat...

(A) After 36 days of battling sharks that kept biting their equipment, scientists have...

A In the late 1990s, psychologist Martin Seligman of the University of Pennsylvania urged...

In a show-business career that spanned over seventy years, Groucho Marx successfully conquered...