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The Weekly Recap

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In case you weren't obsessively refreshing mentalfloss.com all week, here's what you missed:

Top 5 Stories Originally Posted This Week

1. The Strange Early Jobs of 23 Famous People, by Ethan Trex

2. 6 Movies With Far More Depressing Alternative Endings, by Danny Gallagher

3. 5 Alternative Teaching Methods, by Scott Allen

4. One-Man Construction: 7 Lifelong Personal Projects, by Miss Cellania

5. Surfing the Web at 300 Baud, by Chris Higgins

Top 5 Most Commented Stories

1. Is Texting Ruining Our Children?, by Chris Higgins

2. A Brief History of Garden Gnomes, by Linda Rodriguez

3. The Quick 10: Santa Monica Pier, by Stacy Conradt

4. 10 Brilliant (or Puzzling) Baseball Stadium Promotions, by Ethan Trex

5. Don't Eat The Marshmallow, by Chris Higgins

[New Rule: Stories on the 'Most Popular' list have been omitted from the 'Most Commented' chart.]

Top 3 Quizzes Originally Posted This Week

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Top-Selling T-Shirt in Our Store

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"Hokey Pokey Anonymous" beat out "I'm No Rocket Surgeon" to keep its stranglehold on first place. You can get both shirts here.

10 Other Things We Learned

1. C.S. Lewis and Aldous Huxley both died the same day that President Kennedy did (November 22, 1963).

2. Animatronic robots can still rock.

3. Hitler's downfall was bad subtitles.

4. Before they were megastars, Steve Martin and Arnold Schwarzenegger (and many more celebs) appeared on The Dating Game.

5. You can finally put all your old LPs to good (and hilarious) use.

6. Abū Yūsuf Yaʻqūb ibn Isḥāq al-Kindī was the father of perfume.

7. Farmers aren't stupid.

8. The Very Hungry Caterpillar deserves that name.

9. We seem to have several art-loving readers in the Philippines.

10. And finally, as Will's mom and my grandma (and several of our Twitter followers) pointed out this morning, someone at The Today Show has heard of us (fast-forward to roughly 7:20):

Visit msnbc.com for Breaking News, World News, and News about the Economy

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For more important life lessons, follow the _floss on Twitter. Well, maybe not life lessons. But we'll tell you which baseball slugger has a twin brother working in the telecommunications industry.

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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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