Tigers can see 6 times better at night than humans.
305
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
It takes approximately 12 hours for food to entirely digest.
93
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
In one day, adult lungs move about 10,000 litres of air.
11
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
A human being loses an average of 40 to 100 strands of hair a day.
133