The human sigh acts as a physiological reset button.
23
When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
46
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
One human hair can support 3 ounces.
191
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89