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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.
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Is a "hot cube" (analogous to an ice cube) a physical possibility?
These exist. They are not uranium; they are just small (~1 cm) metal blocks. They store a lot of heat, and so when heated in warm water for a while and then placed in coffee, they keep the coffee warm …