I realized that my mental model of a simple three-quark proton was deeply (or simply) wrong.

For an explanation using more showing and less telling: Checking what's inside a proton

You’ve heard the famous statement that “a proton is made from two up quarks and a down quark”. But in this basic article, and this somewhat more advanced one, and in a recent post where I went into some details about what we know about proton structure, I’ve claimed to you that protons are chock full of particles, most of which carry a tiny fraction of the proton’s energy, and most of which are gluons, along with a substantial number of of quarks and antiquarks.

What I want to do in this article is show you evidence that the statements made about proton structure in this post are true. After all, why should you have to take my word for such things? Let’s look at some LHC data, and see how it confirms these notions.

(The author is blooking high-energy physics.)