It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
On average, there's 100 billion neurons in the human brain.
83
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
You forget 90% of your dreams.
256
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Obsessive nose picking is called Rhinotillexomania.
101
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127