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Ralf Haring
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While I'm not sure you would ever actually need to do this, I find this pleasing: there's a technique that lets you find a point any given fraction along the length of an edge of a square of paper, using nothing but folding the page. You want to find the spot exactly 3/7 of the way down the side without a ruler? Here you go.

Really, this is tied to my fascination with mechanical calculation as a whole. There's a whole art out there of computing things using the physical motion of objects, which (until the invention of working electronic computers) had tremendous practical significance -- that's everything from a slide rule or an abacus up to the incredibly intricate and beautiful Curta calculators of the 1940's-70's. (https://www.youtube.com/watch?v=loI1Kwed8Pk) At the extreme, it was used to build full-scale computers, like the fire control computers used in ships. (https://www.youtube.com/watch?v=s1i-dnAH9Y4)

The realization of mathematics in physical objects is beautiful.

Via +Alexander Kruel and +John Baez.
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Clearly the name should have been archaeotalpinology.

"Mr Hjermind has dubbed the practice "moleology", and says it can be as effective as more technical research methods. "The huge reward is that we haven't destroyed anything at the historical mounds in order to get a lot of important information," he says. In 2013, dozens of volunteers were drafted in to sift through mole hills at the site of a Roman fort in northern England. Archaeological digs are forbidden there because it's a scheduled ancient monument, but the moles unearthed numerous artefacts, including a decorative bronze dolphin."
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I saw 35, but I don't mind yellow. It depends. On cars it is the devil, but elsewhere it can often wrap around to so-bad-it's-good territory. My current phone case is a blindingly garish neon yellow atrocity. The green part of the spectrum was what bled together most for me. (via +Dave Cohen)
 
Wow... I'm a tetrachromat!  (And the dress is gold and white, darn it!).  Who knew?  (And yes, I see 37 distinct shades here, and I do hate the color yellow...) #bluedress
Given the sudden interest for the color of dresses and vision, here some of the fascinating findings we did recently.The color nuances we see depend on the number and distribution of cones (=color receptors) in our eye. You can check this rainbow: how many color nuances do you count?You see less than 20 color nuances: you are a dichromats, like dogs, which means you have 2 types of cones only. You are likely to wear black, beige, and blue. 25% of...
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"Park escaped from North Korea in 2007. Now a 21-year-old activist based in Seoul, she’s part of what’s known in Korea as the jangmadang sedae: the black-market generation. During a famine in the North in the mid-1990s, the Kim regime began to tolerate illegal trade because it was the only option to feed a starving population. Since then, black-market commerce has been nearly impossible to stamp out. And some of the hottest commodities—particularly for young people who don’t even remember a North Korea before that underground trade existed—have been foreign music and movies, along with the Chinese-made gadgets to play them."

"A 2010 study by the US Broadcasting Board of Governors found that 74 percent of North Koreans have access to a TV and 46 percent can access a DVD player. Park says that nearly all of her friends in Hyesan had seen a foreign film or TV show. As a result, her generation is the first to have to square the Kim regime’s propaganda with a keyhole view of the outside world. A group called Liberty in North Korea, which works with young defector refugees, finds that many no longer believe in central tenets of North Korea’s political ideology, such as the country’s superior standard of living or the godlike powers of the Kim family. Even the regime is letting that second illusion slide, admitting that Kim Jong-un has health issues—hardly the norm for heavenly beings."
On a cloudy, moonless night somewhere in northeastern China, three men creep through a stand of Japanese Clethra trees. They carry no flashlights, and the sky is so dark that they hear the sound of the rushing Tumen River before they see it: They’ve arrived at the North Korean border. Earlier in the evening at…
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 Citizenfour deserves all the accolades it gets. It's an amazing document of those few days in Hong Kong that got the ball rolling.
As a journalist, Laura Poitras was the quiet mastermind behind the publication of Edward Snowden’s unprecedented NSA leak. As a filmmaker, her new movie <em>Citizenfour</em> makes clear she’s one of the most important directors working in documentary today. And when it comes to security technology, she’s a serious geek.
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Lots of creators accidentally stumble upon their greatest inventions, from potato chips to stainless steel. Now, while trying to develop a pair of protective surgery eyewear, a Berkeley laboratory has inadvertently created a [...]
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Have them in circles
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Ralf Haring

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The land of the free. "The Bank of Canada has said that it is not illegal to deface or mutilate banknotes."
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"Fast forward to 2015. After we had successfully verified Counting and Radix sort implementations in Java with a formal verification tool called KeY, we were looking for a new challenge.  TimSort seemed to fit the bill, as it is rather complex and widely used. Unfortunately, we weren’t able to prove its correctness. A closer analysis showed that this was, quite simply, because TimSort was broken and our theoretical considerations finally led us to a path towards finding the bug (interestingly, that bug appears already in the Python implementation). This blog post shows how we did it."

Including comments by  the titular Tim:
http://bugs.python.org/issue23515
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Ralf Haring's +1's are the things they like, agree with, or want to recommend.
Clean Up Google Music [De-Instant Mix/Radio]
chrome.google.com

Google Music includes auto-generated Instant Mix/Radio Station playlists that cannot be removed.

De-Radio Station Google Music
chrome.google.com

Google Music includes auto-generated Radio Station playlists that cannot be removed.

G+ Hide Posts
chrome.google.com

Allows hiding posts on Google+ without permanently muting them and removing them from all future search results.

G+ Show All Pages
chrome.google.com

The G+ tab strip contains a Pages button. Only three of a user's pages are accessible when you hover over this button.

De-Instant Mix Google Music
chrome.google.com

Google Music includes auto-generated Instant Mix playlists that cannot be removed.

G+ Show Saved Searches
chrome.google.com

The G+ main page would be slightly more useful if the saved searches were available right above the trending topics.

G+ Lightbox - Hide Maximize Icon
chrome.google.com

The G+ lightbox contains a maximize icon that obscures the image and never completely fades out.