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Click me, because the actual quote doesn't fit in here.
4. OPTIONAL QUESTIONNeutrinoKnock knockWho's there?Explain this joke, which assumes that neutrinos have (a) non-zero mass, and (b) move fasterthan the speed of light. Hint: consider the connection between causality and the invariant measures2 = x2 – c2t2
Fine...So basically, if a Neutrino could travel faster than the speed of light, then there would exist reference frames in which it would appear the cause-effect would be switched, and the observers would see the effect, before the cause, which in the joke, they see get the answer to who is at the door before they even knocked.Or something along those lines, and I could use the transformation equations to prove it too.