When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
The average person's skin weighs twice as much as their brain.
131
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Yawns are more contagious among people with closer relationships.
163
Early American humans hunted car-size armadillos and used their shells for houses.
12
By weight, Bone is five times stronger than steel.
417
A human being loses an average of 40 to 100 strands of hair a day.
133
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15