I would like nuclear fusion to become a practical power source. It would provide an inexhaustible supply of energy, without pollution or global warming.
If the total energy of the universe must always remain zero, and it costs energy to create a body, how can a whole universe be created from nothing?
But a machine that was powerful enough to accelerate particles to the grand unification energy would have to be as big as the Solar System - and would be unlikely to be funded in the present economic climate.
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