Neil deGrasse Tyson discusses the fundamentals of matter. He begins by looking at the discovery of the electron, proton, neutron, quark, and neutrino. He then discusses Einstein's theories of relativity and its implication for traveling near the speed of light. He also looks at the unusual implications of quantum mechanics and talks about how quantum tunneling is crucial to producing fusion in the sun. He also discusses the properties of light and the equivalence of mass and energy.