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Watercooler Ammo Reject Pile!

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This week Jason and I started a new, Monday-Thursday newsletter called Watercooler Ammo. The idea is to send readers one super fun bit of trivia, a photo that makes us laugh, or a nerdy, whimsical link, that you can pass on to friends. This week's series included all sorts of fun topics: How an embarrassing Hello Kitty patch helped keep Thai cops in line, the time the Army Corps of Engineers stopped the Niagara falls from flowing, why cell phones might help cure Alzheimer's, and much more. And basically, this whole experiment was just a fun way for Jason and me to send you more nerdy stuff.

For you non-subscribers, here's a sneak peek at the sort of stuff that was almost good enough for the letter, pulled from the first week's reject pile:

Dinosaur Ballet

This video, by animator Ross Butter, makes me laugh every time I watch it. If you're thirsting for culture, there's really nothing quite as satisfying as Dinosaur Ballet. (Link via the always incredible Neatorama)

Downsizing the Solar System?

While you can't exactly pick up the Solar System and put it in your pocket, new research from Nathan Kaib at the University of Washington at Seattle points to the idea that the Solar System is much more compact than previously thought. The link comes from New Scientist magazine, and it's pretty fascinating to think that Kaib's models could help solve some of the mysteries about comets and the Solar System's outer Oort Cloud that have been plaguing astronomers for years.

The Explanatory Sling

As someone who hates (hates!) talking about himself, and repeating the same story over and over, these arm slings seem like a great way to avoid at least the first part of a "How did that happen" conversation. The designs come from
Brazilian designer Andre Montejorge (if you want to look at the rest of his wonderful site, the Google translate function really helps!).
Screen shot 2010-01-21 at 1.13.26 PM

Dinner Table Trick, 2.0

The Presurfer posted this BMW motorcycle ad, which does a wonderfully cheeky revision on that old magic trick. While I'm not a huge fan of promoting ads, this one made me smile, and you'll see why it almost made Watercooler Ammo.

If you want to see stories better than these in your inbox (these are from the reject pile after all), be sure to sign up for Watercooler Ammo here.

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iStock // Ekaterina Minaeva
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Man Buys Two Metric Tons of LEGO Bricks; Sorts Them Via Machine Learning
May 21, 2017
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iStock // Ekaterina Minaeva

Jacques Mattheij made a small, but awesome, mistake. He went on eBay one evening and bid on a bunch of bulk LEGO brick auctions, then went to sleep. Upon waking, he discovered that he was the high bidder on many, and was now the proud owner of two tons of LEGO bricks. (This is about 4400 pounds.) He wrote, "[L]esson 1: if you win almost all bids you are bidding too high."

Mattheij had noticed that bulk, unsorted bricks sell for something like €10/kilogram, whereas sets are roughly €40/kg and rare parts go for up to €100/kg. Much of the value of the bricks is in their sorting. If he could reduce the entropy of these bins of unsorted bricks, he could make a tidy profit. While many people do this work by hand, the problem is enormous—just the kind of challenge for a computer. Mattheij writes:

There are 38000+ shapes and there are 100+ possible shades of color (you can roughly tell how old someone is by asking them what lego colors they remember from their youth).

In the following months, Mattheij built a proof-of-concept sorting system using, of course, LEGO. He broke the problem down into a series of sub-problems (including "feeding LEGO reliably from a hopper is surprisingly hard," one of those facts of nature that will stymie even the best system design). After tinkering with the prototype at length, he expanded the system to a surprisingly complex system of conveyer belts (powered by a home treadmill), various pieces of cabinetry, and "copious quantities of crazy glue."

Here's a video showing the current system running at low speed:

The key part of the system was running the bricks past a camera paired with a computer running a neural net-based image classifier. That allows the computer (when sufficiently trained on brick images) to recognize bricks and thus categorize them by color, shape, or other parameters. Remember that as bricks pass by, they can be in any orientation, can be dirty, can even be stuck to other pieces. So having a flexible software system is key to recognizing—in a fraction of a second—what a given brick is, in order to sort it out. When a match is found, a jet of compressed air pops the piece off the conveyer belt and into a waiting bin.

After much experimentation, Mattheij rewrote the software (several times in fact) to accomplish a variety of basic tasks. At its core, the system takes images from a webcam and feeds them to a neural network to do the classification. Of course, the neural net needs to be "trained" by showing it lots of images, and telling it what those images represent. Mattheij's breakthrough was allowing the machine to effectively train itself, with guidance: Running pieces through allows the system to take its own photos, make a guess, and build on that guess. As long as Mattheij corrects the incorrect guesses, he ends up with a decent (and self-reinforcing) corpus of training data. As the machine continues running, it can rack up more training, allowing it to recognize a broad variety of pieces on the fly.

Here's another video, focusing on how the pieces move on conveyer belts (running at slow speed so puny humans can follow). You can also see the air jets in action:

In an email interview, Mattheij told Mental Floss that the system currently sorts LEGO bricks into more than 50 categories. It can also be run in a color-sorting mode to bin the parts across 12 color groups. (Thus at present you'd likely do a two-pass sort on the bricks: once for shape, then a separate pass for color.) He continues to refine the system, with a focus on making its recognition abilities faster. At some point down the line, he plans to make the software portion open source. You're on your own as far as building conveyer belts, bins, and so forth.

Check out Mattheij's writeup in two parts for more information. It starts with an overview of the story, followed up with a deep dive on the software. He's also tweeting about the project (among other things). And if you look around a bit, you'll find bulk LEGO brick auctions online—it's definitely a thing!

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Name the Author Based on the Character
May 23, 2017
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