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There has recently been considerable discussion of a “replication crisis” in some areas of science. In this book, the authors argue that replication is not a necessary criterion for the validation of a scientific experiment. Five episodes from physics and genetics are used to substantiate this thesis: the Meselson-Stahl experiment on DNA replication, the discoveries of the positron and the omega minus hyperon, Mendel’s plant experiments, and the discovery of parity nonconservation. Two cases in which once wasn’t enough are also discussed, the nondiscovery of parity nonconservation and the search for magnetic monopoles. Reasons why once wasn’t enough are also discussed.
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Back in 1986, EphraimFischbach, Sam Aronson, Carrick Talmadge and their collaborators proposed amodification of Newton’s Law of universal gravitation. Underlying this proposalwere three tantalizing pieces of evidence: 1) an energy dependence of the CP (particle-antiparticleand reflection symmetry) parameters, 2) differences between the measurements ofG, the universal gravitational constant, in laboratories and in mineshafts, and3) a reanalysis of the Eötvos experiment, which had previously been used toshow that the gravitational mass of an object and its inertia mass were equalto approximately one part in a billion. The reanalysis revealed that, contrary to Galileo’sposition, the force of gravity was in fact very slightly different fordifferent substances. The resulting Fifth Force hypothesis included thiscomposition dependence and also added a small distance dependence to theinverse-square gravitational force.
Over the next four yearsnumerous experiments were performed to test the hypothesis. By 1990 there wasoverwhelming evidence that the Fifth Force, as initially proposed, did notexist. This book discusses how the Fifth Force hypothesis came to be proposedand how it went on to become a showcase of discovery, pursuit and justificationin modern physics, prior to its demise.
In this new and significantly expandededition, the material from the first edition is complemented by two essays, onecontaining Fischbach’s personal reminiscences of the proposal, and a second onthe ongoing history and impact of the Fifth Force hypothesis from 1990 to thepresent.
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