George Washington died in 1799 after doctors drained nearly 40% of his blood in an attempt to cure a sore throat.

Urea (the substance contained in the urine) is added to cigarettes for additional flavor.

Art of Topiary is the creation of sculptures from fresh shrubs and flowers.

Bulletproof glass can be single-sided. This means you can fire back and hit your target while remaining safe. Your bullet will only leave a small hole without damaging the rest of the glass.

Actor Robert Downey Jr.'s chewed gum went up for auction for $40,000. Downey once jokingly stuck it on his colleague Jon Favreau's star on the Walk of Fame in Los Angeles, and some "sneaky fan" took the gum for himself and kept it.

If a guide dog without an owner comes up to you on the street, it means that the owner is in trouble somewhere nearby and needs help. Remember this, and one day you might save someone's life.

In America, 250,000 men are beaten by their wives every year.

One fugu fish contains enough poison to kill 30 people and there is no antidote.

There is the white rabbit syndrome, in which a person is always late for something.

Bears are considered a very young biological species, as they appeared "only" 6 million years ago.

Cheese can be addictive because it contains a small concentration of morphine-like compounds.

Bears are considered a very young biological species, as they appeared "only" 6 million years ago.

Until 1752, the New Year was officially celebrated in Great Britain on March 25.

0.06 seconds is the time it takes dogs to determine which direction the sound source is in.

You can make a cow go up a ladder, but you can't make it come down.

Jaguars are excellent swimmers. They love water and prefer to settle near bodies of water. They catch fish or open the shells of river turtles.

By the age of 22, Alexander the Great had conquered half the world.

About 35 million Chinese still live in caves.

Male Puppies Let Female Puppies Win Play Fights

Chivalry isn't dead, at least not in the canine world. Male puppies will pretend to be more vulnerable and allow female puppies to win in an effort to keep the game going longer, so they can get closer to the female. And yes, same-sex play has been studied: when female puppies play with only female puppies, or male puppies play with only male puppies, everyone plays to win. It's only in male-female "fights" that a pup purposefully throws the match.

The posture required for speed-shooting from a holster 😆

The planet's biggest waterfall is in the ocean.

The tallest waterfall you're going to see on land is Angel Falls in Venezuela (above), which has a drop of over 3,200 feet. But that's nothing compared to the Denmark Strait Cataract, which is an underwater waterfall in between Greenland and Iceland formed by the temperature difference in the water on either side of the strait. When the cold water from the east hits the warmer water from the west, it flows underneath the warm water, with a drop of 11,500 feet. According to the National Ocean Service, the flow rate of the waterfall is more than 123 million cubic feet per second, which is 50,000 times that of Niagara Falls.