The free will theorem of John H. Conway and Simon B. Kochen states that if we have a free will in the sense that our choices are not a function of the past, then, subject to certain assumptions, so must some elementary particles. Conway and Kochen's paper was published in Foundations of Physics in 2006.[1] In 2009, the authors published a stronger version of the theorem in the Notices of the American Mathematical Society.[2] Later, in 2017, Kochen elaborated some details.[3]