Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Tigers can see 6 times better at night than humans.
305
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
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
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
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191