Yawns are more contagious among people with closer relationships.
163
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137
Tigers can see 6 times better at night than humans.
305
The average sperm cell swims at 8 inches per hour.
4
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Enamel is hardest substance in the human body.
61
It takes approximately 12 hours for food to entirely digest.
93
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23