system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how we can determine that tiny particles like quarks and neutrinos exist, but cannot determine what is ultimately the source of matter.
gpt
Because, in general, it's easier to know something exists than to know how it exists.

We can determine they exist 1. Because we can break things apart into them and 2. Because we can see how they interact with things.

But, of course, we can't actually see them, because they are so small, and we can't break them into smaller parts, at least not that we know of.

So while we know they are there, we don't know what they are.

I assume that was what your question was, but the wording is weird.