If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
The average sperm cell swims at 8 inches per hour.
4
The human brain is more active during sleep than during the day.
28
Mushrooms are more closely related to humans than they are to plants.
47
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
The human body contains over a billion miles of DNA.
147
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