The most common time for tornadoes to occur are in the afternoon or evening on a hot, humid spring day.

John Chapman became famous in America folklore as "Johnny Applessed" after he plants apple trees throughout the northeastern part of the United States.

Bats avoid running into objects by ... high-frequency sounds and listening for echoes.

Because of his reservations about the issue, ... refused to vote for it.

It has been estimated that if we intend to stay above the starvation level, ... the food supply.

When a country in an early stage of development, investments in fixed capital are vital.

... in the United States declined from twenty million in 1910 to nine million in the 1970's.

Inasmuch he kept mostly to himself, the author of The Treasure of the Sierra Madre was known as the mysterious B. Treuen

To determine an object's force, the mass and speed of the object must be measure.

Automakers Nissa and Ford and several aerospace research facilities in Great Britain are working lately to apply active noise cancellation to entire cars and planes.