The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Yawns are more contagious among people with closer relationships.
163
Your thumb is about the same size as your nose.
124
The world's shortest man measures only 21.5 inches.
73
The average person's skin weighs twice as much as their brain.
131
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
The human brain has the capacity to store everything that you experience.
4k