It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Your fingernails grow faster in summer.
744
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Your heart will pump about 212 million liters in its lifetime.
26
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
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
The human eye blinks an average of 4,200,000 times a year.
233