When my eighth grade daughter was studying physics in her class, I watched a movie with her on the Hadron Collider (" Particle Fever "). We discussed atoms, electrons, protons, neutrons; we discussed orbits and statistics, and then down into the standard model and fermions, leptons, yadda yadda yadda. Anyway, on her test, she was asked to name "elementary" particles. So she wrote something like this: "Most people think electrons, protons and neutrons are elementary, but now we know there are even smaller particles like the Higgs Boson out of which these other particles are made." Anyway, the teacher marked her zero. And when she tried to explain, the teacher insisted that my daughter did not understand the word "elementary." So I come to you to ask someone to DEFINE the word ELEMENTARY in elementary particle, so that I can figure out where I mis-educated my daughter. Does that word - in the K12 lexicon - have a specific meaning at the atom-level and not below? The points on her exam are not an issue -- we let that go. But I need to fix this if I am wrong.