Every year your body replaces 98% of your atoms.
119
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Yawns are more contagious among people with closer relationships.
163
Enamel is hardest substance in the human body.
61
Chewing gum boosts your brain power.
285
The human brain has the capacity to store everything that you experience.
4k
The average sperm cell swims at 8 inches per hour.
76