Fluoride Infested Tap Water
The idea that there is fluoride in tap water and more toxic chemicals is actually one of the oldest conspiracy theories on our list. In the 1940s, people were insisting that adding fluoride to tap water was a Communist plot designed to weaken and mentally impair American children. More modern versions of this theory are essentially that fluoride is supposedly poisonous and the government continues to pump fluoride into the water despite knowing it is dangerous. However, the reality is that the level of fluoride in tap water is so low it is safe for even an infant, and many areas have naturally occurring fluoride in their water. In areas where fluoride has naturally existed in water for centuries, the only effects have been a reduced rate of cavities. These sorts of conspiracy theories play on modern concerns about vague toxins and harmful chemicals in water, but there is no actual proof that the average glass of tap water contains unsafe levels of any sort of chemical.