The molecular structure of (a) the metabolite hydroxynorketamine (HNK), possibly responsible for the anti-depressant effects of ketamine...
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or (b) a child's pull-along toy?
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Q. Why is 666 like an animal anaesthetic?
or (b) a child's pull-along toy?
[h/t Neuroskeptic]
Bonus Ketamine humour:Q. Why is 666 like an animal anaesthetic?
A: They're both the number of the beast.