linkedin post 2021-11-16 05:37:29

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BACKWARDS IN TIME. “Feynman describes three otherwise identical electrons, one moving backwards in time. R. Penrose has popularized the concepts of unitary, deterministic evolution in time according to the Schrodinger equation, the "U-process", versus quantum state vector reduction, the "R-process", or collapse of the wave function.” https://lnkd.in/gDaxUYAS View in LinkedIn
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linkedin post 2021-11-14 06:14:11

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SO ENDS this first of two weekends on the theme of mutations. Darwin’s theory of evolution depended on “descent with modification”, but at the time, nothing was known about genes or mutations. Today, mutations are exquisitely understood, but surprisingly rarer than expected, and even a single mutation can have an enormous phenotypic effect, causing diseases including Sickle-cell anemia, cancer, color blindness, Tay-Sachs disease, and neurofibromatosis. https://lnkd.in/dbDruwJm View in LinkedIn
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linkedin post 2021-11-16 05:36:38

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EXAMPLE. “Imagine a physicist at time T1 creating an electron and a positron from a photon, storing them until time Tn when the antiparticle is annihilated by another electron. He describes the situation as negatively charged, positive energy electrons and a positively charged, negative energy positron, all moving forward in time.” https://lnkd.in/gDaxUYAS View in LinkedIn
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