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The Periodic Table of Periodic Tables... complete with clickable hotlinks. Here's an example of one such:
There's actually a pepper hotter than a habanero? Who knew? Apropos of the above... the Scoville Food Institute looks like a good place to order hot sauce if your local grocer or other supplier thinks Tabasco = Hot Sauce. We don't labor under those conditions, Gentle Reader. We live in New Mexico.
(h/t: A tweet from Clovia)