When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
The human brain doesn't stop developing until about 25 years old.
102
Our brains have a negativity bias and will remember bad memories more than good ones.
15
Yawns are more contagious among people with closer relationships.
163
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Enamel is hardest substance in the human body.
61
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82