I would guess the human mind.
I think that the cigarette which people use to much...
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It depends Celsius is used in most part of the world and Fahrenheit is only used in USA.
It is used for every thing in the nature
Raid is a very common household pesticide it can be used for many insects such as bees,ants,roaches,flys .And can be found in most stores world wide.
Systeme Internationale (SI)
candy floss