An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
A man's beard grows fastest when he anticipates sex.
239
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Only humans shed emotional tears.
331
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
Enamel is hardest substance in the human body.
61