The human brain doesn't stop developing until about 25 years old.
102
Tigers can see 6 times better at night than humans.
305
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
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
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
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