Tigers can see 6 times better at night than humans.
305
Your heart will pump about 212 million liters in its lifetime.
26
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
It takes about 20 seconds for a red blood cell to circle the whole body.
102
It takes approximately 12 hours for food to entirely digest.
93
The human brain doesn't stop developing until about 25 years old.
102
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
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