In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
If the human eye was a digital camera, it would have 576 megapixels.
25
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
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
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
Your fingernails grow faster in summer.
744