Guess the X Blog, Win A Darwin Coffee Mug

Hurry over while the guessing is still good! A Darwin I Think Mug to the first commenter who correctly identifies the symbolism of the name "The X Blog"

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It turns out I've been a member of the Americal Chemical Society for three years now. How do I know? They sent me a new mug.
Dave says that your drinking container reveals your philosophical side.

Pluto or is that too obvious?