So a well-meaning friend shared a post from one of those "kemikuls r bad / big-pharma keeps us sick for profit / magical diluted fairy water cures cancer" type pages, which in turn was a link from a similarly themed website. The link was to an…

A short lesson in why freaking out about a "chemical" because it is "derived from" something nasty (or nasty-sounding) or is "similar to" some other chemical, or contains an element or component that would be nasty in some other compound is…