Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
190
More people have a phobia of frogs than rats.
41
Although African-Americans make up only 13% of the U.S. population, they accounted for one half of the estimated new HIV/AIDS diagnoses in 2004.
70
The human heart creates enough pressure to squirt blood 30 ft.
37
The lifespan of a tastebud is ten days.
130
Your body is creating and killing 15 million red blood cells per second!
14