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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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On average, humans release 2 liters of gas per day by burping and farting.

Science

Earth's tectonic plates move slowly. Some move as fast as human fingernails grow (1 inch/year), while others may move up to 3 times faster.

World

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

Animals

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The human liver can regenerate itself fully. A liver that is only 30% the normal mass can regenerate to a full liver.

Science

Humans have 33 vertebrae in the spine. Snakes can have up to 400 vertebrae, with ribs attached to each one.

Animals

The smallest bone in the human body is found in the middle ear. It is called the staples bone, and it measures 2.8 millimeters long.

Science

The average ant has about 250,000 brain cells; a human has about 10 billion. It takes 40,000 ants to equal the brain of a human.

Science

The human brain receives 400 million bits (47 Megabytes) of information every second. Of those, we are only consciously aware of 2000 bits (0.0002 megabytes).

Science

The human body cannot produce vitamin C, an essential nutrient. To ensure adequate levels of vitamin C it must be consumed daily.

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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.

Science

It's a common belief that humans use only 10 percent of their brains. MRI imaging has shown that humans actually use most of their brain, even while sleeping.

Science

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