### Christopher Peisert

Shared publicly -Dinesh D'Souza poignantly illustrates the morality implicit in Obamacare:

No ObamaCare

No ObamaCare

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Christopher Peisert

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Dinesh D'Souza poignantly illustrates the morality implicit in Obamacare:

No ObamaCare

No ObamaCare

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“The happiest I’ve ever been, the most gratification I’ve ever gotten from a job, are always instances where two things are true: I’m working with people that I love, and I’m solving a problem that I’m personally passionate about.”

--Tom Conrad, CTO Pandora

--Tom Conrad, CTO Pandora

Don't miss the latest Foundation interview by +Kevin Rose: +Tom Conrad of +Pandora on reinventing radio – http://goo.gl/toubU

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+Vladimir Bulatov does it again! At each moment, this movie shows you a tiling of the hyperbolic plane by pentagons, four meeting at each corner, mapped onto a disc with four slits cut out. This mapping is **conformal**, meaning that it preserves angles. As time passes, the hyperbolic plane rotates and we see this crazy movie.

For a more detailed explanation, with tons of great pictures, go here: http://bulatov.org/math/1001/

Here's the short version: there's a way to measure distances on a disk that makes it into a model of the hyperbolic plane. There are actually a number of ways, but Bulatov - and Escher - use the**Poincare disk model**, because in this model straight lines look like portions of circles: very pretty. Then, according to the **Riemann mapping theorem** you can map this disk in a conformal way onto a disk with 4 slits cut out. The hard part is finding a formula for how to do it, and then implementing it on a computer.

For more details, try these picture-packed pages:

http://en.wikipedia.org/wiki/Conformal_map

http://en.wikipedia.org/wiki/Poincar%C3%A9_disk_model

and this more advanced one:

http://en.wikipedia.org/wiki/Riemann_mapping_theorem

#sciencesunday

For a more detailed explanation, with tons of great pictures, go here: http://bulatov.org/math/1001/

Here's the short version: there's a way to measure distances on a disk that makes it into a model of the hyperbolic plane. There are actually a number of ways, but Bulatov - and Escher - use the

For more details, try these picture-packed pages:

http://en.wikipedia.org/wiki/Conformal_map

http://en.wikipedia.org/wiki/Poincar%C3%A9_disk_model

and this more advanced one:

http://en.wikipedia.org/wiki/Riemann_mapping_theorem

#sciencesunday

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Experience the beauty of the world through spectacular time lapses.

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In his circles

56 people

Great article about the Khan Academy from Forbes:

http://www.forbes.com/sites/michaelnoer/2012/11/02/one-man-one-computer-10-million-students-how-khan-academy-is-reinventing-education/?sf7073306=1

http://www.forbes.com/sites/michaelnoer/2012/11/02/one-man-one-computer-10-million-students-how-khan-academy-is-reinventing-education/?sf7073306=1

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Excellent overview of Scala from its creator Martin Ordersky.

FOSDEM 2009 Scala - A Scalable Language

FOSDEM 2009 Scala - A Scalable Language

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Want to create an online course? Check out Course Builder from Google!

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Beautiful short film of Gêrome Pouvreau making the first ascent of Ganesh (5.14a/8B+) in Badami, India.

http://youtu.be/Y3UDkcH5KzI

http://youtu.be/Y3UDkcH5KzI

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Entertaining talk from Google I/O 2012 showcasing awesome new HTML5 features: "The Web Can Do That?!"

https://developers.google.com/events/io/sessions/gooio2012/204/

https://developers.google.com/events/io/sessions/gooio2012/204/

"The Web Can Do That?!" is up

slides: htmlfivecan.com

source/demos: https://github.com/ebidel/html5can

slides: htmlfivecan.com

source/demos: https://github.com/ebidel/html5can

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Computer-programming, cappuccino-imbibing, mountaineer excited about the coming technological singularity.

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