As the new Star Trek movie about to open this week, SciAm interviews Lawrence Krauss, who wrote "The Physics of Star Trek" 15 years ago.
It's a long but informative interview, especially for kids who tend to dream up stuff and think that they can be done now (or soon). Krauss has the ability to throw some cold water of reality to many of these, but that doesn't mean that he is saying that these things are impossible physically, just whether they are PRACTICAL!
Zz.
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