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"We performed an image search on Yahoo for "Comet Holmes" on 2010 April 1. Thousands of images were returned. We astrometrically calibrated---and therefore vetted---the images using the Astrometry.net system. The calibrated image pointings form a set of data points to which we can fit a test-particle orbit in the Solar System, marginalizing out image dates and catching outliers. The approach is Bayesian and the model is, in essence, a model of how comet astrophotographers point their instruments. We find very strong probabilistic constraints on the orbit, although slightly off the JPL ephemeris, probably because of limitations of the astronomer model. Hyper-parameters of the model constrain the reliability of date meta-data and where in the image astrophotographers place the comet; we find that ~70 percent of the meta-data are correct and that the comet typically appears in the central ~1/e of the image footprint. This project demonstrates that discoveries are possible with data of extreme heterogeneity and unknown provenance; or that the Web is possibly an enormous repository of astronomical information; or that if an object has been given a name and photographed thousands of times by observers who post their images on the Web, we can (re-)discover it and infer its dynamical properties! "

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"This sudden brightening triggered a huge wave of interest from astrophotographers all over the world, many of whom posted their images on the web. To find out how many, Dustin Lang from Princeton University in New Jersey and David Hogg at the Max-Planck-Institut fur Astronomie in Heidelberg, Germany, searched the web. They found 2476 different shots of Holmes.

That's a significant astronomical database that represents a huge amount of work. But is it any use?

Today, Lang and Hogg use these images to work out an accurate orbit of Comet 17P/Holmes, a significant achievement given that the data is taken from an ordinary web search and its provenance is entirely unknown."

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American citizens should ask themselves: I work hard and pay my taxes, so why don’t the richest people and the corporations? Why should I pick up the entire tab for keeping the nation running? Why should the people who can afford the most pay the least? If you’re happy with that situation, you can stay at home and leave the protesting to the Tea Party. For the rest, there’s an alternative. For too long, progressive Americans have been lulled into inactivity by Obama’s soaring promises, which come to little. As writer Rebecca Solnit says, “Hope is not a lottery ticket you can sit on the sofa and clutch, feeling lucky…. Hope is an ax you break down doors with in an emergency.” UK Uncut has just shown Americans how to express real hope—and build a left-wing Tea Party.

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"he shooting in Tucson was not an anomaly. It was an inevitability, and as long as we play this foolish game of "both sides are just as bad," it will be inevitable again. "

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Functional pearls are elegant, instructive examples of functional programming. They are supposed to be fun, and they teach important programming techniques and fundamental design principles.

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The Wolfram Demonstrations Project is an open-code resource that uses dynamic computation to illuminate concepts in science, technology, mathematics, art, finance, and a remarkable range of other fields.

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