There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
The human sigh acts as a physiological reset button.
23
Only humans shed emotional tears.
331
The world's shortest man measures only 21.5 inches.
73
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13