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Leo asked me whether entanglement information survives/escapes a black hole. Specifically, he asked me (in only slight paraphrase) whether if one of the particles (headed in different directions) fall into black holes on either end, does the other one know it?

Here’s a video of it on YouTube

Later on he asked me whether, since time dilation increases as you get closer and closer to the speed of light, whether photons, which are actually AT the speed of light, see any time change at all? (Put another way: Is proper time for a photon unchanging?)

(I blame BrainPop!)

My answer: Um …..

Anyway, so I posted it on Physics Forum, a terrific place to ask those hard questions your 5-year-old asks you that that you can’t answer. Here’s the ensuing discussion.