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June 25 2013

Four short links: 25 June 2013

  1. Cliodynamics: History as Sciencea systematic application of the scientific method to history: verbal theories should be translated into mathematical models, precise predictions derived, and then rigorously tested on empirical material. In short, history needs to become an analytical, predictive science.
  2. Cricket — indoor location system from MIT. In a nutshell, Cricket uses a combination of RF and ultrasound technologies to provide location information to attached host devices. Wall- and ceiling-mounted beacons placed through a building publish information on an RF channel. [...] The listener runs algorithms that correlate RF and ultrasound samples (the latter are simple pulses with no data encoded on them) and to pick the best correlation. Even in the presence of several competing beacon transmissions, Cricket achieves good precision and accuracy quickly.
  3. The World at Nightan international effort to present stunning nightscape photos and time-lapse videos of the world’s landmarks against celestial attractions.
  4. Paul Steinhardt on Impossible Crystals (YouTube) — quasi-crystals with five-fold symmetry previously believed impossible. And then he found one, and led an expedition in 2011 to Chukotka in Far Eastern Russia to find new information about its origin and search for more samples. As you do when you’re the Albert Einstein Professor of Science at Princeton, a job title that comes with no pressure at all to bring home the impossible.

March 20 2013

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