A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
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
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
Your fingernails grow faster in summer.
744