It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
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
Our brains have a negativity bias and will remember bad memories more than good ones.
15
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
All 13 minerals necessary for human life can be found in alcohol beverages.
282
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139