11Diazomethane

There is a gas named Diazomethane that is so volatile that it can explode if it comes in contact with sharp edges.
12Ethylene

Due to the exceptionally large amount of ethylene given off by a ripening banana, a banana put into a closed container with green tomatoes will turn them red overnight.
13Sulfur hexafluoride

There is a gas called sulfur hexafluoride that produces the opposite effect of helium by drastically deepening your voice when inhaled.
14Nitrogen trifluoride

Nitrogen trifluoride is a greenhouse gas not regulated by the Kyoto Protocol, but has a global warming potential 17,200 times greater than carbon dioxide. It is released during the manufacturing of flat-panel screens.
15Hydrogen sulfide

Hydrogen sulfide, the gas that gives flatulence its repulsive smell, can help reduce the risk of heart attack, stroke, cancer and help stave off dementia.
16Sulfur dioxide

Sulfur dioxide (the primary component of acid rain) released from coal-fired power plants is being used to make synthetic gypsum and can be found in 30% of drywall produced today.
17Nitrogen

Over 50% of the Nitrogen in our bodies originated from the Haber Process, which was invented in the early 1900s to synthetically create ammonia fertilizer from atmospheric Nitrogen and allowed the global population to grow from 1.6 to 7 billion people.
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18Methane

90%-95% of the methane released by cows comes out of their mouths, while only 5%-10% is released in the form of manure and flatulence.