The human body contains over a billion miles of DNA.
147
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Pain occurs when sounds are above 130 db.
124
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
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
The human sigh acts as a physiological reset button.
23