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xkcd #2933: Elementary Physics Paths
(imgs.xkcd.com)
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Per the alt text: How do we know that particles are the smallest bits? Let's zoom in even further.
These are the questions that make me feel such an insane sense of wonder and awe.
How deep does it go?
How high does it go the other way? How big does existence get?
Why is there something rather than nothing?
What is nothing made of?
It’s turtles all the way down