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- 77 Can a space-faring robot still function over a billion years?
- 52 How would the navies of the present hunt down a sea monster with sonar invisibility?
- 35 How to sustain/create a 4 foot tall city?
- 31 How would the indigenous peoples of North America have developed in the absense of the Europeans?
- 26 Why would radio signals be invented/transmitted when communication is not an issue?
- 20 How believable are "X-ray sights"?
- 17 How plausible is it for nuclear power to be invented but not nuclear weapons?
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