0 points
90 f was the average temperature of the human body. 0 in fahrenheit used to be the eutectic point of water and ammonium chloride. Eventually though, the scale was adjusted so that the lower point was the freezing temperature of water (32 degrees) and the upper point was the boiling point of water (212 degrees) this was chosen so that there would be a highly divisible number between them (180) due to this adjustment, 0 isn’t special in fahrenheit, and neither is 90.
