> Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something. I’m totally open to being wrong. I’m e

> Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something. I’m totally open to being wrong. I’m eager to learn - which is generally why I share information. If I don’t readily share what I know to be true, like in this case, nobody will ever correct me and I’ll spend the rest of my life being incorrect. On HN you generally start by telling someone why they’re wrong and supporting that in some way. I.E. if you know/believe fluoride was added for another reason - that’s a good place to start. Or if you know/believe purified water is not corrosive, that would be a good place to start.