Werner Karl Heisenberg proposed that proton and neutron could be seen as two states of a nucleus.
海森堡提出，可以把质子、中子看作是同一实体——核子的两种状态。
Physicist Werner Heisenberg, left, was challenged by the philosopher Karl Popper, right, to defend his paradoxical uncertainty principle.
物理学家维尔纳·海森堡(左)受到哲学家卡尔·波普尔(右)的挑战，针对其测不准原理的悖论。
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