>Whenever you offer up an analogy, you want to choose it carefully, and be sure to convey its limitations. Yes, maybe if you're presenting at a conference or a

>Whenever you offer up an analogy, you want to choose it carefully, and be sure to convey its limitations. Yes, maybe if you're presenting at a conference or a lecture or something like that. Not if you want to get a bunch of kids motivated/interested in a topic. In the case of this video, the limitations can only be understood by people in that field. Sure, You can hand-wave a general clarification like "this isn't actually how it is, because <insert boring text that nobody will remember>" - which would be pointless (IMO) and convey no real information. Because the "real" information takes several years of academic training to understand and comprehend. >And trust me, learning GR with Kip Thorne (http://en.wikipedia.org/wiki/Kip_Thorne http://en.wikipedia.org/wiki/Kip_Thorne) makes the above commenter qualified to offer an opinion. Sorry but it changes nothing in my mind. If the OP had said "Hey I would have said it this way and guess what I've successfully used it to motivate X, Y and Z into taking up science" - I'd have been way more impressed and given the "above comment the respect it deserves".