Tigers can see 6 times better at night than humans.
305
Human hair and fingernails continue to grow after death.
7
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
One human hair can support 3 ounces.
191
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
There are about 255 babies born worldwide every minute.
46