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what is the smallest thing in the universe?

my friends kid asked me, and i have no clue what to tell him. i dont want to look dumb so i told him id find out and let him know.
 
Neutrinos are the only thing we have evidence for being the smallest thing. Theoretically, it would be strings or branes. Perhaps the quantum foam.
 
Define "thing". Your mind can conceive of the infinitesimally small, or at least the mathematical concept thereof.
 
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