If the novelty of holding an elaborate bearing (possibly connected to some motion-sensitive LEDs) is wearing thin, have no fear: with a 3D printer and a little ingenuity, you can make your own double-pendulum fidget spinner, a chaotic system that is intensely sensitive to initial conditions, such that it becomes very hard to predict the motion of the pendulum when you set it to swinging. Read the rest
The official video for Nobody Speak, by DJ Shadow and Run The Jewels, was directed by Sam Pilling and stars Igor Tsyshkevych and Ian Bailey as very NSFW diplomats on a tear.
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The video depicts a meeting of leaders that quickly descends into chaos, a scene not unlike what is unfolding in governments around the globe... Says DJ Shadow: "We wanted to make a positive, life-affirming video that captures politicians at their election-year best. We got this instead.”
Come on. Throw her a ball. [Video Link]
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Incredible footage of the TSA line at Chicago Midway airport yesterday, which snakes out the airport atrium and into the surrounding transit hallways -- it's hundreds of yards long.
It follows news of massive layoffs at the TSA, though apparently most of the planned firings haven't happened yet, so it's only going to get worse.
The only bright spot is that the airlines themselves appear to be at the end of their tether: the lines are depriving them of passengers who must be rebooked. And, thanks to the Brussels attacks, everyone knows that the compressed packs of humans created by airport security theater are a prime target in their own right.
Good to know no dangerous breast milk got on those half-empty flights, though. Read the rest
Brian, a graduate student of Applied Mathematics at Columbia University, has a Tumblr called Fouriest Series where he posts his math and physics visualizations. His explanations are clearly written. He also provides the Mathematica code he used to create his animations.
From his post about chaos and double pendulums:
Summarized by mathematician Edward Lorenz, "Chaos [is] when the present determines the future, but the approximate present does not approximately determine the future.“
There’s an important distinction to make between a chaotic system and a random system. Given the starting conditions, a chaotic system is entirely deterministic. A random system, on the other hand, is entirely non-deterministic, even when the starting conditions are known. That is, with enough information, the evolution of a chaotic system is entirely predictable, but in a random system there’s no amount of information that would be enough to predict the system’s evolution.
The simulations above show two slightly different initial conditions for a double pendulum — an example of a chaotic system. In the left animation both pendulums begin horizontally, and in the right animation the red pendulum begins horizontally and the blue is rotated by 0.1 radians (≈ 5.73°) above the positive x-axis. In both simulations, all of the pendulums begin from rest.
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Are you curious about complexity? Do you dig dynamic systems and emergent phenomena? The Santa Fe Institute, one of the birthplaces of chaos theory, is now offering a free "Introduction to Complexity" online course, open to anyone. No science or math background required! The instructor is computer scientist Melanie Mitchell, author of the excellent and entertaining book Complexity: A Guided Tour. The course started last week but it's not too late to join!
In this eleven-week course you'll learn about the tools used by scientists to understand complex systems. The topics you'll learn about include dynamics, chaos, fractals, information theory, self-organization, agent-based modeling, and networks. You’ll also get a sense of how these topics fit together to help explain how complexity arises and evolves in nature, society, and technology. There are no prerequisites. You don't need a science or math background to take this introductory course; it simply requires an interest in the field and the willingness to participate in a hands-on approach to the subject.
Introduction to Complexity Read the rest