It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69
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
Yawns are more contagious among people with closer relationships.
163
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Pain occurs when sounds are above 130 db.
124
Our brains have a negativity bias and will remember bad memories more than good ones.
15