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Q&A How can I make a jetpack with supercooling?

So let's say I have a super cooling "battery" basically a brick that cools anything that touches one end of it to ~0k. Now, using handwavium I can thermally isolate it so that it doesn't just cool ...

4 answers  ·  posted 7y ago by Devon Muraoka‭  ·  last activity 7y ago by Devon Muraoka‭

Question reality-check science-fiction vehicles