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
Colorado switched mile marker "420" to "419.99" to stop people from stealing it.
37
During the Cold War, the US had planned to detonate a nuclear weapon on the moon.
25
Ice cream cones were popularized in America during the 1904 World’s Fair in Saint Louis when an ice cream vendor ran out of cups and asked a nearby waffle vendor to roll up his waffles to hold the ice cream.
17
203 million dollars is spent on barbed wire each year in the U.S.
65
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5