The reindeer is the only mammal that can see UV light.
17
Peanut butter and jelly sandwiches were originally considered a delicacy, only enjoyed by those of the upper class.
9
The United States has paved enough roads to circle the Earth over 150 times.
72
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
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