A person will burn 7 percent more calories if they walk on hard dirt compared to pavement.
45
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The human brain uses approximately as much energy as a 10 watt light bulb.
120
Putting sugar on a wound or cut will greatly reduce pain and speed up the healing process.
25
The human brain is more active during sleep than during the day.
28
The first patented condom was meant to be reused!
47

