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View all 2-pack 3-pack 5-pack 6-pack accessory alpha particle antibottom anticharm antidown quark antilepton antimuon antineutron antinucleon antiparticle antiproton antiquark antistrange quark antitau antitop antiup astrophysics atom atomic badge beta decay Big zip-up black blue boson bottom quark brane button calabi-yau CERN charm quark chemistry Christmas cmbr collage collider cosmology custom dark matter darkness and light down quark electron electron-antineutrino electron-neutrino ESA everyday matter feynman glueball gluon graviton green greeting card grey heavyweight helium atom higgs boson holiday hypothetical large Laserfest lepton light blue light orange lightweight m1-3 neutrino magnet massive attack meson middleweight mini mini particles mini poster muon muon-antineutrino muon-neutrino neutralino neutrino neutron nucelon nucleon orange ornament pencil case periodic table photon pillow pin pink pins playing cards pomeron positron poster proton purple purse qcd quantum chromodynamics quark red reversible set standard model sticker strange quark string theory supersymmetry SUSY tachyon tau tau-antineutrino tau-neutrino teaching manipulative theoretical top quark universe universe in a box up quark W boson W-boson white whole zoo yellow z boson zipper pouch