The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
If your DNA was stretched out it would reach to the moon 6,000 times.
256
You forget 90% of your dreams.
256
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
You can't tickle yourself.
29
The human brain has the capacity to store everything that you experience.
4k
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15