Laughter is a colorless and slightly sweet gas, which can play an anesthetic role. The British chemist joseph priestley discovered nitrous oxide in 1772. The scientific name is nitrous oxide, 1798. After the employees in priestley accidentally inhaled this gas, they couldn't help laughing and dancing, hence the name "nitrous oxide".

1844, American dentist Wells inhaled nitrous oxide and asked his assistant to pull out his teeth. The tooth was pulled out painlessly. Since then, nitrous oxide has entered the hospital as an anesthetic.

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Nitrous oxide can be used not only as anesthetic, but also as aerosol for hair cream and cooking spray in food processing industry, as well as as as combustion improver for automobile engine and rocket oxidant.

The more widely known usage of "laughing gas" is to make cake decorations, fancy coffee and molecular food. The cream gun that can often be seen in cake shops and cafes is to beat the cream into thick foam by "laughing gas". Nitrous oxide is harmless to human body when it is used in food processing, but these uses can easily lead to nitrous oxide being used for "entertainment" and even used by criminals for crimes.

People's Network-"Laughter" hides the knife in the smile