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32 votes
Accepted

Could a steam-age civilization trial-and-error their way to a nuclear reactor if they had access to enough fissile material?

8 votes

How do I recover an incoming Voyager 1 probe?

5 votes
Accepted

What would be the structural impact of an oscillating orbit on a planet?

3 votes

Practical uses for a city on top of another city?

3 votes

What kind of tsunami could be expected from removing a large-sized island from the map?

2 votes

Breaking the Laws of Thermodynamics without Invoking Magic or the Divine

2 votes

How can we build a space probe's computer to survive centuries of interstellar travel?

1 vote

multiple retinas in one eye

1 vote

How should the eyes be arranged that can see microscopic objects?

0 votes

How could the sky be orange in a breathable atmosphere?

0 votes

How would the development of computers be altered if it took longer to find out a practical way to synthesise silicon crystals for transistors?