Yawns are more contagious among people with closer relationships.
163
We share 70% of our DNA with a slug.
218
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
Gorillas can catch human colds and other illnesses.
205
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
It takes approximately 12 hours for food to entirely digest.
93
The average person will go on a date at least 100 times before they finally marry.
33
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161