Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Enamel is hardest substance in the human body.
61
The average person's skin weighs twice as much as their brain.
131
The average sperm cell swims at 8 inches per hour.
76
Every year your body replaces 98% of your atoms.
119
The human brain uses approximately as much energy as a 10 watt light bulb.
120
Our Right Lungs takes more air than our left lung.
194
The human brain has the capacity to store everything that you experience.
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