Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Your heart will pump about 212 million liters in its lifetime.
26
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
It takes approximately 12 hours for food to entirely digest.
93
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11