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Don't pay attention to TV programs about science. They're not science, they're entertainment. And the whole point is to inspire people to take an interest in science.

Real science doesn't assume, it hypothesises. And the hypotheses have to be tested. And no self-respecting scientist will use the word "theory" in talking about things like wormholes - they're hypotheses. "Theory" is a word used in science to refer to things that have been tested so extensively that it would take an extraordinary piece of evidence to disprove it.