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History of the World: Roaming Body Parts

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As we approach the release date of The Mental Floss History of the World—our first hardcover book—we'll be highlighting some of our favorite stories here on the blog. Today's post is not for the squeamish. If you prefer body parts to stay in the body proper, well, you might want to skip this one.

Louis XVII's heart

heartPoor Louis-Charles led a very short, tragic life. His parents were Louis XVI and Marie Antoinette, after all, which would be enough tragedy for anyone. He was imprisoned just like his parents were - in a cold, dark cell with no toilet or bath. He escaped the immediate fate of his parents, but the revolutionaries were concerned that he would try to seize power or that the French aristocrats would rally on his behalf. So, they forced him into the shoe-making trade and forced him to curse the names of his parents. They didn't outright kill him, but they refused to allow him medical treatment. He died of tuberculosis, and rumor has it that his poor body was riddled with sores, tumors and scabies. The body was unceremoniously dumped in a mass grave, but not before the doctor who performed the autopsy managed to cut out Louis-Charles' heart. He hid it in a handkerchief and preserved it. The doctor eventually tried to return it to the royal family, but they didn't believe it was his and refused to take it. One of the doctor's students later stole the heart, and when he died, his widow gave it to the archbishop of Paris. Apparently it was still at risk in Paris, so it was taken to Spain. It's now back in France, though, at the Saint Denis Basilica near Paris.

Napoleon's penis

Urban legend? Nope, it's probably true. According to Napoleon's servant Ali, he and a priest named Vignali removed certain bits and pieces of the Little Corporal during his 1821 autopsy. Vignali's descendants sold all of the "souvenirs" he look from Napoleon, including his little corporal which was described as "one inch long and resembling a grape". Fittingly, a urologist bought it in 1977, for the bargain-basement price of $3,000. You would think that a urologist might want to put it on display, but Dr. Lattimer's intent was really quite the opposite: he felt like Napoleon's penis was being ridiculed and he wanted to put a stop to it. Once the penis came into his possession, he refused to let anyone see it.

Picture 4.pngIt's the greatest deal in the history of history books! Our first hardback, The Mental Floss History of the World: An Irreverent Romp Through History's Best Bits, hits stores later this month, and we're so excited that we've teamed up with the fine folks at Amazon.com to give you a special deal. Pre-order the book before October 27th and we'll throw in 6 FREE MONTHS of mental_floss magazine! Just click here to get the deal now.


For more about the book, check out our FAQ.

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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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Opening Ceremony
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These $425 Jeans Can Turn Into Jorts
May 19, 2017
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Opening Ceremony

Modular clothing used to consist of something simple, like a reversible jacket. Today, it’s a $425 pair of detachable jeans.

Apparel retailer Opening Ceremony recently debuted a pair of “2 in 1 Y/Project” trousers that look fairly peculiar. The legs are held to the crotch by a pair of loops, creating a disjointed C-3PO effect. Undo the loops and you can now remove the legs entirely, leaving a pair of jean shorts in their wake. The result goes from this:

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Opening Ceremony

To this:

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Opening Ceremony

The company also offers a slightly different cut with button tabs in black for $460. If these aren’t audacious enough for you, the Y/Project line includes jumpsuits with removable legs and garter-equipped jeans.

[h/t Mashable]

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