You need to know about currently believed limitations (2nd law of thermodynamics meaning that perpetual motion is unlikely, or relativity meaning that faster than light is unlikely). Those are indeed technical nitty-gritty for most people.
I remember sitting behind two teenagers on a bus discussing whether invisibility paint or anti-gravity paint would be invented first.
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timeasmymeasure
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Date: 2010-01-26 01:50 pm (UTC)I remember sitting behind two teenagers on a bus discussing whether invisibility paint or anti-gravity paint would be invented first.