The efficiency of a heat engine is fundamentally limited by the temperatures at which it operates; you can never completely convert heat into work. elaborate
Some superconductors, when cooled below their critical temperature, exhibit the Meissner effect, completely expelling magnetic fields from their interior. elaborate
Retrocausality, if true, could mean that future events could influence the past, potentially explaining some quantum entanglement phenomena. elaborate
Fusion reactions power the sun and stars. elaborate
String theory proposes the existence of up to 11 dimensions, most of which are curled up and invisible to us. elaborate