army1987 comments on Open thread, July 28 - August 3, 2014 - Less Wrong Discussion
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In regular English, “exercise increases lifespan” doesn't mean ‘all exercise increases lifespan’ any more than “ducks lay eggs” means ‘all ducks [including males] lay eggs’.
Well, there's a frustrating sort of ambiguity there: it's able to pivot between the two in an uncomfortable way which leaves one vulnerable to exploits like the above.
Sure, and it's also vulnerable to abuse from the other side:
"I have bogosthenia and can't exercise because my organs will fall out if I do. How should I extend my lifespan?"
"You should exercise! Exercise increases lifespan!"
"But my organs!"
"Are you saying exercise doesn't increase lifespan? All these studies say it does!"
"Did they study people with no organs?"
"Why are you bringing up organs again? Exercise increases lifespan. If you start telling people it doesn't, you're going to be responsible for N unnecessary deaths per year, you quack."
"... organs?"
Totally right.