Sometimes you just have to do something geeky and nerdy and goofy and fun. That's my position anyway. I'm not convinced there's a huge market for coasters (outside of informal christmas gift exchanges) but I rather liked the idea of tossing some chemistry in. At first I was going to do include tea, coffee, and soda but that didn't quite work out. The first molecule I picked for tea, Theflavin, turned out to be too large to fit on a coaster. Seriously. And of course soda is a complex, unholy solution of ichor and other not-so-good things. And it occurred to me that nobody's probably going to need a coaster with their coffee, so I dropped those three and went with Catechin (tea), caffeine (pretty much everything) and ethanol (boozes) in addition to sucrose (sugar) and good ol' dihydrogen monoxide (water). I figure this way, no matter what someone's drinking, they'll probably have a constituent molecule on their coaster.