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Hypothetical situation in which, for simplification, only some physical aspects are considered in order to further understand or reveal contradictions between the laws governing them.

29 votes
5 answers
7k views

Is a "hot cube" (analogous to an ice cube) a physical possibility?

Is it possible to fabricate a uranium or plutonium "hot cube" that could be used to keep a cup of coffee hot? Basically a piece of fissile material, shielded, and covered with a non-toxic material th …
Mark Harrison's user avatar