I think Hank Green put it well when he said
> A quark is a fundamental constituent of matter
> Observed in 1968 through deep elastic scatter
> We found that protons aren’t as simple as we thought
> We thought they were solid particles but they are not
>
> Protons in fact are made up of three separate pieces
> It just gets more confusing as our knowledge increases
> But that is what a quark is; It’s a piece of a proton
> And they also make up other things including the neutron
[Strange Charm](https://youtu.be/U0kXkWXSXRA)
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