A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
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
The average sperm cell swims at 8 inches per hour.
4
The human body contains over a billion miles of DNA.
147
Your fingernails grow faster in summer.
744
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
We share 70% of our DNA with a slug.
218