The planet Pluto travels around the sun in an elliptical orbit approximately once every 248 years.

Professor Johnson has a thorough knowledge of Egyptian hieroglyphics.

It is not possible for people to remember everything that they have thought, felt, or done.

The ultimate cause of the Civil War was the bombardment of Fort Sumter.

Microprocessors, unlike computers, are programmed to complete defined tasks.

The mission at San Juan Capistrano was partially destroyed by an earthquake in 1812.

The "New Deal" was President Franklin D. Roosevelt's plan to counteract the economic hardship of the Depression.

Insects are the most diverse class of animals in number, form, and natural range.

On the Fahrenheit scale, 32 degrees is the freezing point of pure water.

Exchanges of language and culture were a direct result of commerce.