What are some popular sci-fi gadgets that are actually possible to construct in theory? I am talking about gadgets we see in science fiction movies that obey the laws of physics of our universe and could theoretically be constructed, barring the limitations of materials, energy and time faced by our civilization at the moment.
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If a sun burns hotter with greater mass, does adding a tonne of water make it hotter?
What are some popular sci-fi gadgets that are actually possible to construct in theory?
I am talking about gadgets we see in science fiction movies that obey the laws of physics of our universe and could theoretically be constructed, barring the limitations of materials, energy and time faced by our civilization at the moment.