Okay there are some GREAT answers but they are too long for an ELI5, so I’ll try my best at 5am and no sleep, feel free to correct me:
The term atom is for something that can’t be divided. Solid. The end of the scale.
Turns out atoms are made of of even smaller things that we can’t pin-point where they are, they aren’t still, they move all the time like they’re flickering.
Because that is what EVERYTHING is made of those things, while to us a table in front of you is always real and “solid” and you can always pin-point where it is about as well as your hand, in reality, nothing is.
It is very abstract, but if you try to scale up to how we see things… It is like this table is made of smoke, one that doesn’t fly away but keeps making the shape of the table. Yes, it exists, yes, it is there, but good luck trying to pin-point every single part of it.
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