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>So, one grain of sand is a heap?

"Is a single grain a heap" doesn't look like a paradox to me. A "heap" is just a word with an ambiguous definition. Once you define it, you'll have your answer :)

>Then, nothing's really the same

If that was the case, intelligence would've been impossible. We need similarities as well as the differences to be able to compare things (including abstract concepts)

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