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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Tigers can see 6 times better at night than humans.
305
The average sperm cell swims at 8 inches per hour.
4
Pain occurs when sounds are above 130 db.
124
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
On average, there's 100 billion neurons in the human brain.
83
The human brain has the capacity to store everything that you experience.
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