Tigers can see 6 times better at night than humans.
305
On average a woman has 4 sexual partners in her lifetime.
-143
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
A human being loses an average of 40 to 100 strands of hair a day.
133
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
If the human eye was a digital camera, it would have 576 megapixels.
25