There have been studies and experiments tested on animals. These tests have resulted in the conclusion that fluoride damages the brain of animals. 43 humans have been tested with fluoride, and the results are that fluoride reduces their intelligence. It can also impair fetal brain development.
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It can be the beginning of "starting to think to know what the other person thinks". When people know each other for a long time, they often think they know what the other person thinks or knows. This leads to the idea that if they can complete the sentence of another person in certain cases, they will be able to do so in all cases. This is however not necessarily true.
