Enamel is hardest substance in the human body.
61
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
A human being loses an average of 40 to 100 strands of hair a day.
133
On average, there's 100 billion neurons in the human brain.
83
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
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
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132