You can't tickle yourself.
29
Sound travels about 4 times faster in water than in air.
408
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
A man earned 4 million airline miles for free without breaking any laws by using his credit card to purchase free-delivery $1 coins from the U.S. mint.
11
Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
190