The world's shortest man measures only 21.5 inches.
73
It takes approximately 12 hours for food to entirely digest.
93
Babies crawl an average of 200m a day.
212
Yawns are more contagious among people with closer relationships.
163
You can't tickle yourself.
29
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13