A Native American tribe in South Dakota collects bottle caps left by campers, using them as currency. Several banks in the area now recognize the caps as legal tender.
225
Alaska is the only state that can be typed on one row of keys on a QWERTY keyboard.
147
The first female self-made millionaire in America was a black woman.
4
One million Americans, about 3,000 each day, take up smoking each year. Most of them are children.
-86
During the Cold War, the US had planned to detonate a nuclear weapon on the moon.
25
The United States consumes 25% of all the world's energy.
51
In 1963, the US Military created an artificial ring around Earth, similar to that of the planet Saturn. The ring was made of copper needles and was used for worldwide communications in the case that the Soviets disabled all other methods of communication.
26