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The Lesser-Known Race Riots of Los Angeles

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Sure, we've all heard about the Watts riots in 1965 and the 1992 Rodney King riots, each of which were sparked by racial tensions and cost the city of Los Angeles millions of dollars and dozens of lives. But LA's rich history of riots goes back much further than that; from its roots as an ethnically diverse, rough-and-tumble Old West outpost to its current incarnation as a megasprawl metropolis, the city never lost its volatile mixture of extreme diversity and sometimes extreme intolerance. Like a Coke-n-Mentos experiment, it couldn't help but release all that pressure once in a while -- and here are some lesser-known times that it did.

The Zoot Suit Riots

That's right, it's not just an annoying Cherry Poppin' Daddies song; the so-called "Zoot Suit Riots" were also a tragic white-vs-Chicano conflict that embroiled the city in violent clashes for days. In the early days of America's involvement in WWII, white servicemen in Los Angeles would walk though a Chicano neighborhood on their way to barracks after nights of drinking, sparking frequent fights with Chicano youth, known as "Zoot-Suiters" for the then-outlandish double-breasted suits they favored. There were brawls, robberies, men were sent to the hospital, and as the tensions grew, the police stepped up pressure on the Chicano community, in July 1942 arresting more than 600 in one fell swoop. The following year, tensions boiled over: a sailor was badly injured in a fight, and in retaliation, more than 50 sailors headed to East LA, where they randomly targeted Chicano youths (especially the ones in Zoot Suits). Days of back-and-forth fighting ensued, described this way by one eyewitness:

Marching through the streets of downtown Los Angeles, a mob of several thousand soldiers, sailors, and civilians, proceeded to beat up every zoot suiter they could find. Pushing its way into the important motion picture theaters, the mob ordered the management to turn on the house lights and then ran up and down the aisles dragging Mexicans out of their seats. Streetcars were halted while Mexicans, and some Filipinos and Negroes, were jerked off their seats, pushed into the streets and beaten with a sadistic frenzy.

Days later, the military police finally got involved, quelling the violence and declaring the city of Los Angeles off-limits to military personnel. Though thousands of Chicanos were arrested during the riots, only one sailor faced any penalty, paying a small fine.

The Chinatown Massacre

massacre.jpgThe dead Chinese in Los Angeles were hanging at three places near the heart of the downtown business section of the city; from the wooden awning over the sidewalk in front of a carriage shop; from the sides of two "prairie schooners" parked on the street around the corner from the carriage shop; and from the cross-beam of a wide gate leading into a lumberyard a few blocks away from the other two locations. One of the victims hung without his trousers and minus a finger on his left hand.

That was 1871, when Los Angeles' main thoroughfares were still made of dirt, and roving lynch mobs could operate with impunity. In this case, more than 500 whites descended on a Chinese neighborhood after a white man was caught in the crossfire between two rival Chinese factions; they pulled every Chinese resident they could find from their homes and businesses, beating them, robbing them and killing as many as 23. After the incident, East Coast newspapers dubbed Los Angeles "a bloodstained Eden."

The Sunset Strip riots

Perhaps not "race" riots per se, but an interesting chapter in LA's history of violence nonetheless, were the Sunset Strip "curfew riots" of the 1960s. It was hippies vs. cops, stemming an ongoing clash between an insubordinate youth counter-culture that was spreading across the country and the nervous adults who tried to quell it with curfews, arrests and relentless traffic stops. The Socialism Journal characterizes the riots this way:

In the long struggle against curfews and crowd control on the Sunset Strip in the late 1960s (parodied in teen exploitation film Riot on the Sunset Strip), white youth increasingly were persuaded that their resistance to a violent sheriff's department was a second front to the battle being waged by the Black Panther Party in south central Los Angeles. The culminating showdown between thousands of white kids and the sheriffs in 1969 was mobilised by a psychedelic leaflet demanding, 'Free the Strip! Free Huey!' The battle over the urban night had joined forces with the revolution.

The ultimate evidence that no one took the hippies' Strip protests very seriously is the film Riot on the Sunset Strip, for which this is the hilarious trailer:

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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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8 Common Dog Behaviors, Decoded
May 25, 2017
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Dogs are a lot more complicated than we give them credit for. As a result, sometimes things get lost in translation. We’ve yet to invent a dog-to-English translator, but there are certain behaviors you can learn to read in order to better understand what your dog is trying to tell you. The more tuned-in you are to your dog’s emotions, the better you’ll be able to respond—whether that means giving her some space or welcoming a wet, slobbery kiss. 

1. What you’ll see: Your dog is standing with his legs and body relaxed and tail low. His ears are up, but not pointed forward. His mouth is slightly open, he’s panting lightly, and his tongue is loose. His eyes? Soft or maybe slightly squinty from getting his smile on.

What it means: “Hey there, friend!” Your pup is in a calm, relaxed state. He’s open to mingling, which means you can feel comfortable letting friends say hi.

2. What you’ll see: Your dog is standing with her body leaning forward. Her ears are erect and angled forward—or have at least perked up if they’re floppy—and her mouth is closed. Her tail might be sticking out horizontally or sticking straight up and wagging slightly.

What it means: “Hark! Who goes there?!” Something caught your pup’s attention and now she’s on high alert, trying to discern whether or not the person, animal, or situation is a threat. She’ll likely stay on guard until she feels safe or becomes distracted.

3. What you’ll see: Your dog is standing, leaning slightly forward. His body and legs are tense, and his hackles—those hairs along his back and neck—are raised. His tail is stiff and twitching, not swooping playfully. His mouth is open, teeth are exposed, and he may be snarling, snapping, or barking excessively.

What it means: “Don’t mess with me!” This dog is asserting his social dominance and letting others know that he might attack if they don’t defer accordingly. A dog in this stance could be either offensively aggressive or defensively aggressive. If you encounter a dog in this state, play it safe and back away slowly without making eye contact.

4. What you’ll see: As another dog approaches, your dog lies down on his back with his tail tucked in between his legs. His paws are tucked in too, his ears are flat, and he isn’t making direct eye contact with the other dog standing over him.

What it means: “I come in peace!” Your pooch is displaying signs of submission to a more dominant dog, conveying total surrender to avoid physical confrontation. Other, less obvious, signs of submission include ears that are flattened back against the head, an avoidance of eye contact, a tongue flick, and bared teeth. Yup—a dog might bare his teeth while still being submissive, but they’ll likely be clenched together, the lips opened horizontally rather than curled up to show the front canines. A submissive dog will also slink backward or inward rather than forward, which would indicate more aggressive behavior.

5. What you’ll see: Your dog is crouching with her back hunched, tail tucked, and the corner of her mouth pulled back with lips slightly curled. Her shoulders, or hackles, are raised and her ears are flattened. She’s avoiding eye contact.

What it means: “I’m scared, but will fight you if I have to.” This dog’s fight or flight instincts have been activated. It’s best to keep your distance from a dog in this emotional state because she could attack if she feels cornered.

6. What you’ll see: You’re staring at your dog, holding eye contact. Your dog looks away from you, tentatively looks back, then looks away again. After some time, he licks his chops and yawns.

What it means: “I don’t know what’s going on and it’s weirding me out.” Your dog doesn’t know what to make of the situation, but rather than nipping or barking, he’ll stick to behaviors he knows are OK, like yawning, licking his chops, or shaking as if he’s wet. You’ll want to intervene by removing whatever it is causing him discomfort—such as an overly grabby child—and giving him some space to relax.

7. What you’ll see: Your dog has her front paws bent and lowered onto the ground with her rear in the air. Her body is relaxed, loose, and wiggly, and her tail is up and wagging from side to side. She might also let out a high-pitched or impatient bark.

What it means: “What’s the hold up? Let’s play!” This classic stance, known to dog trainers and behaviorists as “the play bow,” is a sign she’s ready to let the good times roll. Get ready for a round of fetch or tug of war, or for a good long outing at the dog park.

8. What you’ll see: You’ve just gotten home from work and your dog rushes over. He can’t stop wiggling his backside, and he may even lower himself into a giant stretch, like he’s doing yoga.

What it means: “OhmygoshImsohappytoseeyou I love you so much you’re my best friend foreverandeverandever!!!!” This one’s easy: Your pup is overjoyed his BFF is back. That big stretch is something dogs don’t pull out for just anyone; they save that for the people they truly love. Show him you feel the same way with a good belly rub and a handful of his favorite treats.

The best way to say “I love you” in dog? A monthly subscription to BarkBox. Your favorite pup will get a package filled with treats, toys, and other good stuff (and in return, you’ll probably get lots of sloppy kisses). Visit BarkBox to learn more.

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