The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
You forget 90% of your dreams.
256
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
The average person will go on a date at least 100 times before they finally marry.
33
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
We share 70% of our DNA with a slug.
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