claytonnash / Clayton Nash

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Huffduffed (205)

  1. Encryption, Privacy Are Larger Issues Than Fighting Terrorism, Clarke Says : NPR

    David Greene talks to former national security official Richard Clarke about the fight between Apple and the FBI. The FBI wants an iPhone that was used by one of the San Bernardino shooters unlocked.

    —Huffduffed by claytonnash

  2. Podcast: The First Amendment speech debate on college campuses

    Share:EmailAre there limits to what can be said at and displayed on college campuses?

    Yale’s Silliman College

    This podcast discusses recent controversies at Yale University and the University of Missouri involving the First Amendment, the 14th Amendment, free speech and hate speech.

    At Yale, the controversy started after an e-mail from its Intercultural Affairs Committee encouraged students to show restraint in their Halloween costume selections. Two professors objected, saying universities “have become places of censure and prohibition.” That debate is on-going. And at Missouri, the controversy stared over the school’s response to several racial incidents and led to protests that forced the school’s president and its chancellor to resign.

    Joining National Constitution Center scholar in residence Michael Gerhardt to discuss these issues are two experts in constitutional law.

    Erwin Chemerinsky is Dean and Distinguished Professor of Law at the University of California, Irvine, School of Law. Dean Chemerinsky is also a member of the National Constitution Center’s Coalition of Freedom Advisory Board.

    Greg Lukianoff is president and CEO of the Foundation for Individual Rights in Education. Greg is a graduate of American University and Stanford Law School, where he focused on First Amendment and constitutional law. He is also the author of Unlearning Liberty: Campus Censorship and the End of American Debate  and Freedom From Speech.

    To listen to the full podcast, click on the following link or use the player below.

    Download this episode (right click and save)

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  3. Brains Sweep Themselves Clean Of Toxins During Sleep : Shots - Health News : NPR

    While mice sleep, their brain cells shrink, allowing cerebrospinal fluid to flow easily around them. The fluid can then clear away toxins. This finding appears to offer the best explanation yet of why animals and people need sleep.

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  4. There exists a classical model of the photon after all | Light Blue Touchpaper

    Many people assume that quantum mechanics cannot emerge from classical phenomena, because no-one has so far been able to think of a classical model of light that is consistent with Maxwell’s equations and reproduces the Bell test results quantitatively.

    Today Robert Brady and I unveil just such a model. It turns out that the solution was almost in plain sight, in James Clerk Maxwell’s 1861 paper On Phyiscal Lines of Force in which he derived Maxwell’s equations, on the assumption that magnetic lines of force were vortices in a fluid. Updating this with modern knowledge of quantised magnetic flux, we show that if you model a flux tube as a phase vortex in an inviscid compressible fluid, then wavepackets sent down this vortex obey Maxwell’s equations to first order; that they can have linear or circular polarisation; and that the correlation measured between the polarisation of two cogenerated wavepackets is exactly the same as is predicted by quantum mechanics and measured in the Bell tests.

    This follows work last year in which we explained Yves Couder’s beautiful bouncing-droplet experiments. There, a completely classical system is able to exhibit quantum-mechanical behaviour as the wavefunction ψ appears as a modulation on the driving oscillation, which provides coherence across the system. Similarly, in the phase vortex model, the magnetic field provides the long-range order and the photon is a modulation of it.

    We presented this work yesterday at the 2015 Symposium of the Trinity Mathematical Society. Our talk slides are here and there is an audio recording here.

    If our sums add up, the consequences could be profound. First, it will explain why quantum computers don’t work, and blow away the security ‘proofs’ for entanglement-based quantum cryptosystems (we already wrote about that here and here). Second, if the fundamental particles are just quasiparticles in a superfluid quantum vacuum, there is real hope that we can eventually work out where all the mysterious constants in the Standard Model come from. And third, there is no longer any reason to believe in multiple universes, or effects that propagate faster than light or backward in time – indeed the whole ‘spooky action at a distance’ to which Einstein took such exception. He believed that action in physics was local and causal, as most people do; our paper shows that the main empirical argument against classical models of reality is unsound.

    —Huffduffed by claytonnash

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