davidad

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If you’re not paying for it, you’re not the customer—you’re the product.
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Complex Numbers

  • Pedestrian A: I've never heard of that.
  • Pedestrian B: Complex fractions! It's a thing! One numerator, two denominators.
permalink One mistyped consonant. A world of difference.

One mistyped consonant. A world of difference.

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What the cat’s eye tells the cat’s brain

permalink If you’re in the Boston area and don’t have plans tonight (Sunday at 7pm), please consider coming to my a cappella concert with the glorious MIT Asymptones, on the MIT campus at lecture hall 10-250. I have two solos and a speaking part in the intra-song skits!

If you’re in the Boston area and don’t have plans tonight (Sunday at 7pm), please consider coming to my a cappella concert with the glorious MIT Asymptones, on the MIT campus at lecture hall 10-250. I have two solos and a speaking part in the intra-song skits!

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Pendulum waves: What happens when you start 15 pendulums all at once, with the length of each tuned to perform one more oscillation in a complete cycle than the next?

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Chattanooga, TN: Geek City of the Future

Let’s be honest: if I listed Chattanooga among Boston, San Francisco, New York, Austin, and Raleigh-Durham as one of the most interesting places in the country for people who want to build awesome new stuff, you’d probably think I was joking. And if I told you that a few weeks ago, I would have been.

Through a fortuitous connection, I was recently introduced to a group of forward-thinking entrepreneurs. They’ve all had success in big business - from brokering stocks to brokering freight. But they see potential in Chattanooga, a small town, not set in its ways; a town that you can realistically imagine leaving your stamp on for decades to come; a town that you can shape to your vision, if your vision is sound. New York and Palo Alto have become what they’ve become, but there’s an excitement and a power that comes from the process of becoming, and that’s what I found underway this week in Chattanooga.

You see, this group of individuals (who call themselves the Lamp Post Group) are passionately committed to a vision of Chattanooga as a thriving, modern city with a technology-driven economy. But they understand that making that happen requires attracting the right kind of people, and forming the right kind of culture (a sort of chicken-and-egg problem). So, in order to help kick-start that process, they brought me to the city to show me first-hand the developments that are unfolding.

Boy, was I surprised by what I saw. They’ve installed the most advanced consumer fiber network in the country - gigabit speed on tap; they’ve got a national supercomputing center where cutting-edge research on finite difference analysis is being conducted; they’ve got a hackerspace; their public buses are 100% electric; they’ve got a Gehry-esque art gallery overlooking the river, a beautiful aquarium, even Indian and Thai food (which, for some reason, I wasn’t expecting). Not only that, but I met a number of smart people working on cool projects, and just last week I heard they had a collective startup launch event. Yet although there’s a rapidly growing startup community, you won’t have to compete just to be noticed by local VCs and angels (who do, in fact, exist!).

Chattanooga is still far from the obvious choice for locating a high-tech startup. But if you’re the sort of person who doesn’t usually take the obvious choice, you owe it to yourself to check it out. I know I’ll be back before long.

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Last Friday, I performed “Finite Simple Group” with the Asymptones at MIT’s Campus Preview Weekend. Enjoy! (And sorry for all the flat high notes. I’m working on it for our May 8 concert.)

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Igudesman & Joo: Classical Music Comedy Duo.

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The unification of all different fields, being powered by information technology.
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Consider the probability of the assertion, made by Sir John Maundeville in his Travels, that Noah’s Ark may still be seen on a clear day, resting where it was left by the receding waters of the Flood, on the top of Mount Ararat. For this assertion to be probable on Sir John’s testimony, it must first of all be probable that he made it from his recollection rather than his fancy. Then, on the assumption that he wrote as he remembered what he saw or heard told, it must be probable also that his memory could be trusted against a lapse such as might have occurred during the long years after he left the region of Mount Ararat and before he found in his writing a solace from his “rheumatic gouts” and his “miserable rest.” Finally, on the assumption that his testimony was honest and his memory sound, it must be probable that he or those on whom he depended could be sure that they had truly seen Noah’s Ark, a matter made somewhat doubtful by his other statement that the mountain is seven miles high and has been ascended only once since the Flood.
— Algebra of Probable Inference, by Richard T. Cox
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I'm Sorry Sir, The Ocean is Full

  • Beachgoer: What?
  • Lifeguard: Yes, it's full up. I'm afraid I can't let you in until someone else comes out.
  • Beachgoer: What are you on about? There's plenty of room!
  • Lifeguard: Well, you'll have to take that up with the Fire Marshal.
  • Beachgoer: The Fire Marshal?!
  • Lifeguard: Yes, you see, if there were to be a fire in the ocean--
  • Beachgoer: A fire? In the OCEAN?!
  • Lifeguard: Please, sir, calm down. I realize it may be counterintuitive, but if, say, an oil slick were to pass by, and happen to be ignited, everyone would need a safe escape route.
  • Beachgoer: Oh, yes, can't have a panicked crowd rushing the doors, can we?
  • Lifeguard: Indeed, sir. Ah, that young lady with the inflatable horsey has just come out. Sorry for the inconvenience, sir.