Seeing as we already know protons and neutrons are made of quarks etc., what else do you hope to find inside them?

Question: Seeing as we already know protons and neutrons are made of quarks etc., what else do you hope to find inside them?
- Keywords:
  neutron,
  proton,
  quark,
  subatomic
Asked by trishbeanx to David on 17 Jun 2013.
- David Freeborn answered on 17 Jun 2013:
  
  Quite a lot! In Quantum theory, every particle generates a sea of “virtual” particles around it: these could be almost any type of particle. Just occasionally they get enough energy for us to observe it.
  So we might discover all sorts of things: from Dark Matter particles (we don’t yet know what they are) or types of particle nobody has observed before.

trishbeanx commented on 17 Jun 2013:

What do you mean by virtual particles? Does this mean they aren’t actually there?

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David commented on 18 Jun 2013:

Well, in the weird physics of quantum mechanics, observing a particle changes its properties.
When we observe an atom, we change its properties, and make new particles appear inside it. These are called virtual particles.

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David commented on 18 Jun 2013:

If that doesn’t make sense, don’t worry. Nobody really, fully understands how quantum physics works, yet.

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Question: Seeing as we already know protons and neutrons are made of quarks etc., what else do you hope to find inside them?