This article is from 2000, which, on the internet, seems like a ridiculously long time ago, but my guess is that scientific fart research moves pretty slowly, so I think we're safe to assume that most of this info is pretty up to date.
Here are some informative and/or thought-provoking excerpts:
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While Levitt [the world's leading authority on flatulence...in 2000, anyway] says he has never treated someone who held a fart in too long, there are dangerous side effects (including dizziness and headaches).
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Pumpernickel, the dark-grain bread, means "goblin that breaks wind" in Old German.-
"Noisy farts can smell just as bad as silent ones," he says. "That's another myth that needs to be put to rest."
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It's a strange thing, though, farts. Take, for example, the expression "old fart." It's a term of insult when spoken in the third person, but one of pride when spoken about oneself.
That last observation's a little suspect if you ask me, but, then again, my dad and his siblings used to refer to their dad and his third wife as the Old Fart and the Fartress, and when you make it a title and capitalize it all fancy, yeah, sure, I can see people getting excited about it.