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StoryCorps: American Stories We All Should Hear

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By StoryCorps, author of Listening Is an Act of Love
story corps pb.pngCable television and supermarket glossies bombard you with the same kinds of stories—partying heiresses, movie stars in rehab, and the wronged wives of politicians. Most of us can recite who is divorcing whom in Hollywood without the slightest effort. That's just how ubiquitous these stories have become.
But author and award-winning radio producer Dave Isay believes there are more important stories to tell. In 2003, Isay created StoryCorps to record intimate interviews between loved ones and friends. Over the years, the organization has collected and preserved tens of thousands of American stories; memories full of heart and rich with humanity, covering everything from the Great Depression to the war in Iraq. In 2007, StoryCorps published 50 of their favorite stories in the New York Times best-seller Listening Is an Act of Love. We'll let them take it from here:
Just one week after Listening Is an Act of Love was released in paperback, Barack Obama was elected President. One story from the book reminds us just how much things have changed in our nation's capital.

Sam Harmon came to StoryCorps with his grandson Ezra Awumey, then 11 years old and a precocious grade school student in the DC area. The boy asked his granddad some tough questions, including this one: "What was the saddest moment in your life?" Sam didn't hesitate to answer.

It was when he was serving in the Navy during World War II. On a day off, he drove into Washington from Norfolk, Virginia, where he was stationed. His shipmates were headed for the bars; Sam walked around sightseeing, visiting all the monuments. Before driving his shipmates back to the base, he decided to relax a little by going to the movies.

"There was a glass with the ticket seller behind it, and off of the glass reflected the Capitol dome. And I just thought to myself, "˜What a way to end a day—drinking in all this democracy.' I called for the ticket. She was reading. She punched the machine. I reached my hand to get the ticket and lay down the money. She pulled it back. And she said, "˜You can't come in here.' She saw my black hand and refused to sell me the ticket. The Capitol dome was superimposed on her angry face—angered that I would have the temerity to ask to buy a ticket. And I just walked the streets crying all night, betrayed that my country could force me to fight a war but say, "˜You're not a good enough citizen to come to a movie.' "¦ The saddest moment—without any exception."

You can listen to Sam tell his full story here.

Want more stories? Click here to pick up a copy of Listening Is an Act of Love today. (It makes a great gift!) And to hear additional StoryCorps stories, visit their website or tune in to NPR's Morning Edition on Fridays.

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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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