A collection of views about the meaning of quantum mechanics principally attributed to Niels Bohr and Werner Heisenberg, including the idea that quantum mechanics is intrinsically indeterministic, with probabilities calculated using the Born rule, and the principle of complementarity, which states that objects have certain pairs of complementary properties which cannot all be observed or measured simultaneously.

plural of Copenhagen plank

An exercise where one of man’s lower extremities is put on an elevated surface (which contradistinguishes it from a mere side plank) and, posting the upper body on the opposing forearm, the ensuing maneuvering room is perused to charge the inner thigh of the other leg.