It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
The average sperm cell swims at 8 inches per hour.
4
The human brain is more active during sleep than during the day.
28
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
Yawns are more contagious among people with closer relationships.
163
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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