Yawns are more contagious among people with closer relationships.
163
People in parts of Western China put salt in their tea instead of sugar.
16
A study had men report their own penis size, and the average was found to be 6.1-6.5 inches. A subsequent clinical study actually measured penises, and found the average size to be 5.1-5.7 inches.
-3
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Every human spent about half an hour as a single cell.
144
Only 2% of the worlds population is blonde.
15