
If by "magic" you mean "differential geometry and clear physical reasoning".
I realised I forgot to say about anti-gravity. If you can find me a type of fluid that has a very negative pressure, I can give you anti-gravity. Otherwise you'd have to find me some gravitons with an opposite "charge", and I'm not entirely sure I could formulate a sensible theory of gravity that included them.
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Fri 23 Sep 2011, 21:55,
archived)
I realised I forgot to say about anti-gravity. If you can find me a type of fluid that has a very negative pressure, I can give you anti-gravity. Otherwise you'd have to find me some gravitons with an opposite "charge", and I'm not entirely sure I could formulate a sensible theory of gravity that included them.