Hyenas have exceptional strength. Their heart is twice the size of a lion's heart.
A bullet shot out of a rifle can exit the barrel at speeds up to about 2796 miles/h (4500 km/h). That's more than three times the speed of sound.
Chopping up onions activates a chemical reaction that releases sulfur gas. Water in the human eye reacts with sulfur gas to create sulfuric acid. Although the amount of acid is very small, it's enough to cause a burning sensation in the eye.
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Sloths are the slowest animals on Earth. They also sleep a lot, 15 to 18 hours per day while hanging upside down.
The South American fish "Pacu" is the world's only fish that eats nuts. It's jaws are so powerful that it can crack open nuts underwater.
The planet Venus is named after the Roman goddess of love. It is the brightest planet in the night sky and the only planet to be named after a female.
The heart of a giraffe weighs more than 10 kilograms (22lbs) and beats twice as fast as the human heart.
Hummingbirds can fly up, down, left, right, forward, backward, and upside down too!
Your nose contributes to taste more than your tongue. Around 80% of taste is actually coming from your smell receptors. Hold your nose when you eat something and you'll see it's 'taste' will not be as strong.
Earth worms have on average five hearts and no lungs. They absorb oxygen through their skin.
The first cell phone was unveiled in 1973 by Motorola. It is now referred to as "the brick phone" because if it's large size.
In 1979 two couples with their children escaped East Germany in a home made hot air balloon. The balloon climbed to 6000 feet and landed in West Germany. It was their second attempt, their first landed 200 yards short of the border.
The human sneeze can travel faster than 100 miles per hour (160 km/h). It is not recommended to hold back a sneeze, as the extreme pressure may cause ear damage.
Penguins can drink sea water. They have glands just above their eyes which remove salt from their blood and expel it out through their nose.
An octopus has nine brains and three hearts. It has one central brain plus eight additional brains inside each tentacle.
25 tons of sea weed is needed to produce 15kg of iodine.
