Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Your skeleton keeps growing until you are about 35, then you start to shrink.
74
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
103
A sneeze can travel as fast as 100 miles per hour.
43
Your thumb is about the same size as your nose.
124
During menstruation, the sensitivity of a woman's middle finger is reduced.
47
A fetus develops fingerprints at eighteen weeks!
32
Research indicates that babies who suck on pacifiers are more prone to ear aches.
21