On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Yawns are more contagious among people with closer relationships.
163
Your thumb is about the same size as your nose.
124
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132