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The heart of a giraffe weighs more than 10 kilograms (22lbs) and beats twice as fast as the human heart.

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The biggest animal ever known to live on Earth is the Titanosaurus. It measured 140ft (40m) long and 65ft (20m) tall.

Rainforests are home to more than 30 million animal and plant species. That's half of the wildlife on Earth.

Rainforests are home to more than 30 million animal and plant species. That's half of the wildlife on Earth.

The blue whale is the loudest animal on earth. A blue whale call can travel hundreds of miles across the water, and it is louder than an F18 jet fighter.

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Studies show that traffic and air pollution are to blame for 12% of heart attacks worldwide.

Scientific studies suggest that eating a handful of pistachio nuts per day helps reduce cholesterol and maintain a healthy heart.

Hummingbirds do everything fast. In just one minute they can flap their wings 50 times, have their heart beat 1200 times, and take 250 breaths of air.

Some Reindeer travel further than any other animal on Earth. They can travel more than 60,000 miles in their lifetime; that's more than twice the distance around the world.

If the hair on your body was longer and thicker like animal fur, having goosebumps would fluff up your fur coat and make your hairs stand up. It would also provide more insulation to keep you warmer.

All scorpions glow under UV light. The Emperor Scorpion in West Africa glows blue or green. UV lights are perfect for finding scorpions in a home.

An ostrich egg equals 24 chicken eggs, and can feed 12 people breakfast. They weigh about 3 pounds (1.4kg).

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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Giraffes require the least sleep of any mammal, about 20-30 minutes per day. They get their sleep by taking short power naps while standing up, usually for five minutes or less.

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