Show Notes for November 13, 2014

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  • Uranium Ore: Amazon Customer Reviews
  • Pneumatic post
    • Wikipedia
    • Paris
      • "A major network of tubes in Paris was in use until 1984, when it was abandoned in favor of computers and fax machines."
      • "1866: in Paris (until 1984, 467 kilometers in total length from 1934)"
      • The Parisian Network
      • Images on google
  • Mass
    • International prototype of the kilogram: "the SI unit of mass: "The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram""
    • The Not-So-Perfect Kilogram and Why the Metric System Might Be Screwed
      • "At its most recent weigh-in in 1988, it was found to be 0.05 milligrams—about the weight of a grain of sand—lighter than its underling replicas."
      • "The meter, for example, used to be defined by a metal rod stored alongside Le Grand K. But in 1983, it was redefined as the distance light travels in a vacuum during 1/299,792,458 of a second."
  • WeChat
    • "The largest standalone messaging app by monthly active users", with "438 million active users" as of August 2014, "with 70 million outside of China".
    • Drift Bottles
  • Loudspeaker enclosure
    • "Wharfedale, in some designs, reduced panel resonance by using two wooden cabinets (one inside the other) with the space between filled with sand."
    • "Home experimenters have even designed speakers built from concrete, granite and other exotic materials for similar reasons."
    • Electrostatic loudspeaker
      • "levels of distortion one to two orders of magnitude lower than conventional cone drivers in a box, the extremely light weight of the diaphragm which is driven across its whole surface, and exemplary frequency response"
      • "Disadvantages include sensitivity to ambient humidity levels and a lack of bass response, due to phase cancellation from a lack of enclosure […] This relative lack of loud bass is often remedied with a hybrid design using a dynamic loudspeaker, e.g. a subwoofer, to handle lower frequencies, with the electrostatic diaphragm handling middle and high frequencies"
    • Images of concrete speakers on Google
  • Returning iOS apps purchased on the App Store
    • "All sales are final"
    • But it is still possible to get a refund if the purchase was not authorized, done by mistake, or there is a problem with the app.
    • It isn't clear how serious the problem needs to be; for instance, is a "missing" feature, not mentioned in the description, an acceptable reason for a return?
  • Elon Musk Explains How He Wrecked An Uninsured $1 Million McLaren F1

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