1Chlorine Trifluoride
Chlorine Trifluoride was so dangerous that the Nazis refused to use it. Due to its unstableness, the chemical was unfit for weaponization. The chemical burned at over 2000°C and was able to melt bunkers, tanks, and burn entire cities.
2Natural gas
Natural gas is odorless. The smell we experience comes from a harmless chemical called mercaptan, first ordered by the Texas Legislature in 1937 to be put into gas so that people could smell a leak. This law was introduced after the worst school disaster in US history occurred from a gas explosion in New London killing nearly 300.
3Oxygen
50 to 85% of the oxygen on Earth comes from the ocean, mainly from phytoplankton.
4Xenon
The noble gas Xenon can be used as a near-perfect general anesthetic. It works fast, has minimal side effects, protects your brain, is environmentally friendly, and can be used at normal air pressure. The only downside is it's expensive and can't be synthesized.
5Helium
When helium is cooled to almost absolute zero, the lowest temperature possible, it becomes a liquid with surprising properties. It can flow against gravity and will start running up and over the lip of a glass container.
6Pure oxygen
Breathing 100% pure oxygen for more than 16 hours can lead to irreversible lung damage, damage to the retinas, and eventually, death.
7Radon bath
Radon (a radioactive gas that can cause lung cancer) baths exist in the town of Khmilnyk, Ukraine. They advertise to treat a host of medical conditions and around 50,000 people a year use them.
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8Carbon dioxide
Too much carbon dioxide in a crowded room can make you dumber.
9Carbon Monoxide
Carbon Monoxide is used in the USA to make meat appear fresher. This practice is banned in Canada, Japan, Singapore, and the European Union.
10Nitrogen chips
The air used in bags of chips is actually Nitrogen, which keeps the chips from going stale.