I read/summarized chapter one to my 4yo today and we had a nice conversation: Me: If x = the beach then dx = a piece of sand on the beach and ∫dx = all the lit

I read/summarized chapter one to my 4yo today and we had a nice conversation: Me: If x = the beach then dx = a piece of sand on the beach and ∫dx = all the little pieces of sand 4yo: ...and all of the parts of the ocean because that's the whole beach I'm also excited to do more with him as he gets older :)