Only humans shed emotional tears.
331
The average person's skin weighs twice as much as their brain.
131
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Early American humans hunted car-size armadillos and used their shells for houses.
12
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Your heart will pump about 212 million liters in its lifetime.
26