Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
You can only remember 4 things at a time.
31
The Statue of Liberty is made out of copper. When originally built, it looked like a shiny new penny!
10
The first webcam was used in 1991 by Cambridge researchers for checking the coffee pot without leaving their desks.
10
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Only about 2% of the world population has green eyes.
36
If you yelled for 8 years, 7 months and 6 days, you would have produced enough sound energy to heat one cup of coffee.
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