Spyke

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Gonna need some ice for that burn.

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A methyl group is the name given to single carbon (with 3 hydrogens attached) when substituted onto a larger chemical moiety (a structure or motif in chemistry). When people speak about methyl groups they're mostly speaking about those single carbon methyl group being attached to a heteroatom (atoms other than carbon and hydrogen in organic chemistry, like nitrogen, oxygen, sulfur, etc.).

Methamphetamine (N-methylamphetamine or N-methyl alpha-methyl-phenyl-ethylamine in full form) has a methyl group on it's amine (nitrogen or N-position), which drastically alters its psychological effects and the way it's synthesized by chemists (requiring methylamine). The methyl group there prolonges the stimulating effects, while also providing serotonergic effects (generally euphoric effects caused by interaction with the serotonin receptor transport protein), which gives it much greater addiction potential.

Methyl groups in general don't "make drugs stronger" like the other guy said. To consider drug receptor interaction you need to take into account how well a molecule fits into the receptor you're targetting as a whole.

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The healing power of crystals

Fetid fluorite will sometimes give off pure fluorine, which is the exact opposite of healing, but I think it's cool though as I normally only get to breathe the fumes of the organic solvents at my lab. I would love to have perfluorinated lungs, so I myself can become the forever chemical.

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Do e-cigarettes actually work?

It helps most in the sense that it's not at all as unhealthy. Anything you hear to the contrary is simply scaremongering and terrible advice. Almost half of smokers die from smoking related illness where I live. The negative health effects and oxidative damage from pyrolysis and from vapourizing a liquid are simply not comparable.

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Danger rule

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Physicists will say that, but does that mean that they'll just be able to magically derive advanced ochem?

It's like they have already memorized the exact state of the entire universe and just figure it out from there.