On average, there's 100 billion neurons in the human brain.
83
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
Your fingernails grow faster in summer.
744
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
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
Yawns are more contagious among people with closer relationships.
163
You forget 90% of your dreams.
256
You can't tickle yourself.
29