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Heat. Everything ends up as heat.
Until the day that even heat dies.
Well, heat just spread over a larger area but it doesn't get destroyer nor turn into any other form of energy.
But it doesn't die per se.
If you consider particle excitement to be the definition of heat and subparticle fields to be different forms of energy then it does actually change, but that's just semantics.
If all discernable heat is unobservable and unobtainable, then semantics don't matter. Everything still dies. I'd include "heat" in that mix, but that's waxing philosophical
So where do smells go?
Just open a window. I'm sure they noticed, but they'll be cool about it.
they get trapped in your nose hairs, this is why old people have really stinky noses.
Really? How can you smell?
well i'm not very old yet so i can smell many different ways depending on how recently i showered and whether i put on perfume
;) nah I was being doofily punny, like “how could you tell?”
Well not all sound.
But yes 99.99%