You can't tickle yourself.
29
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Tigers can see 6 times better at night than humans.
305
Enamel is hardest substance in the human body.
61
Human hair and fingernails continue to grow after death.
7
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Your thumb is about the same size as your nose.
124
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22