Weight is a measure of the pull of gravity on an object.

Neptune has the fastest winds recorded in the solar system.

Cyrus McCormick invented a mechanical reaper.

Pluto also rotates on its side.

Uranus, its rings, and fifteen of its moons rotate on their sides.

Saturn's largest moon, Titan, has it's own atmosphere.

General Robert E. Lee surrendered at Appomattox Court House, Virginia.

The first battle of the Civil War was won by the South at Fort Sumter.

South Carolina was the first state to leave the Union.

Eli Whitney invented the cotton gin.