[gosub100]

There are about 16 particles in the standard model. We've only mastered the electron, proton, photon, and have dabbled in using neutrons and neutrinos. Imagine the possibilities if we some day are able to use all the remaining particles?

[interroboink]

For some definition of "mastered" (:

If I recall correctly, the we can't really solve the equations for anything more complex than a helium atom (or is it hydrogen?). That's not to say there isn't useful work we can do, numerical approximations, etc. But things do get astoundingly complex very quickly, even with the "mastered" bits.

[jiggawatts]

Muons and positrons are used regularly in industry. Neutrinos have been used to image the inside of the Sun.