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12 Things You Might Not Know About Juneteenth

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Wikimedia Commons // Public Domain

There's more than one Independence Day in the U.S. On June 19, 1865, General Gordon Granger rode into Galveston, Texas, and announced that slaves were now free. Since then, June 19 has been celebrated as Juneteenth across the nation. Here’s what you need to know about the historic event and celebration.

1. SLAVES HAD ALREADY BEEN EMANCIPATED—THEY JUST DIDN'T KNOW IT.

The June 19 announcement came more than two and a half years after Abraham Lincoln issued the Emancipation Proclamation on January 1, 1863, so technically, from the Union's perspective, the 250,000 slaves in Texas were already free—but none of them were aware of it, and no one was in a rush to inform them.

2. THERE ARE MANY THEORIES AS TO WHY THE LAW WASN'T ENFORCED IN TEXAS.

News traveled slowly back in those days—it took Confederate soldiers in western Texas more than two months to hear that Robert E. Lee had surrendered at Appomattox. Still, some have struggled to explain the 30-month gap between the proclamation and freedom, leading some to suspect that Texan slave owners purposely suppressed the announcement. Other theories include that the original messenger was murdered to prevent the information from being relayed or that the Federal government purposely delayed the announcement to Texas in order to get one more cotton harvest out of the slaves. But the real reason is probably that Lincoln's proclamation simply wasn't enforceable in the rebel states before the end of the war.

3. THE ANNOUNCEMENT ACTUALLY URGED FREED SLAVES TO STAY WITH THEIR FORMER OWNERS.

General Order No. 3, as read by General Granger, said:

"The people of Texas are informed that, in accordance with a proclamation from the Executive of the United States, all slaves are free. This involves an absolute equality of personal rights and rights of property between former masters and slaves, and the connection heretofore existing between them becomes that between employer and hired labor. The freedmen are advised to remain quietly at their present homes and work for wages. They are informed that they will not be allowed to collect at military posts and that they will not be supported in idleness either there or elsewhere."

4. WHAT FOLLOWED WAS KNOWN AS "THE SCATTER."

Obviously, most former slaves weren't terribly interested in staying with the people who had enslaved them, even if pay was involved. In fact, some were leaving before Granger had finished making the announcement. What followed was called "the scatter," when droves of former slaves left the state to find family members or more welcoming accommodations in northern regions.

5. NOT ALL SLAVES WERE FREED INSTANTLY.

Texas is a large state, and General Granger's order (and troops to enforce it) were slow to spread. According to historian James Smallwood, many enslavers deliberately suppressed the information until after the harvest, and some beyond that. In July 1867 there were two separate reports of slaves being freed, and one report of a Texas horse thief named Alex Simpson whose slaves were only freed after his hanging in 1868.

6. FREEDOM CREATED OTHER PROBLEMS.

Despite the announcement, Texas slave owners weren't too eager to part with what they felt was their property. When legally freed slaves tried to leave, many of them were beaten, lynched, or murdered. "They would catch [freed slaves] swimming across [the] Sabine River and shoot them," a former slave named Susan Merritt recalled.

7. THERE WERE LIMITED OPTIONS FOR CELEBRATING.

When freed slaves tried to celebrate the first anniversary of the announcement a year later, they were faced with a problem: Segregation laws were expanding rapidly, and there were no public places or parks they were permitted to use. So, in the 1870s, former slaves pooled together $800 and purchased 10 acres of land, which they deemed "Emancipation Park." It was the only public park and swimming pool in the Houston area that was open to African Americans until the 1950s.

8. JUNETEENTH CELEBRATIONS WANED FOR SEVERAL DECADES.

It wasn't because people no longer wanted to celebrate freedom—but, as Slate so eloquently put it, "it’s difficult to celebrate freedom when your life is defined by oppression on all sides." Juneteenth celebrations waned during the era of Jim Crow laws until the civil rights movement of the 1960s, when the Poor Peoples March planned by Martin Luther King Jr. was purposely scheduled to coincide with the date. The march brought Juneteenth back to the forefront, and when march participants took the celebrations back to their home states, the holiday was reborn.

9. TEXAS WAS THE FIRST STATE TO DECLARE JUNETEENTH A STATE HOLIDAY.

Texas deemed the holiday worthy of statewide recognition in 1980, the first state to do so.

10. JUNETEENTH IS STILL NOT A FEDERAL HOLIDAY.

Though most states now officially recognize Juneteenth, it's still not a national holiday. As a senator, Barack Obama co-sponsored legislation to make Juneteenth a national holiday, though it didn't pass then or while he was president. One supporter of the idea is 91-year-old Opal Lee—since 2016, Lee has been walking from state to state to draw attention to the cause and plans to make the steps of the U.S. Capitol in Washington, D.C., her last stop.

11. THE JUNETEENTH FLAG IS FULL OF SYMBOLISM.

Juneteenth flag designer L.J. Graf packed lots of meaning into her design. The colors red, white, and blue echo the American flag to symbolize that the slaves and their descendants were Americans. The star in the middle pays homage to Texas, while the bursting "new star" on the "horizon" of the red and blue fields represents a new freedom and a new people.

12. JUNETEENTH TRADITIONS VARY ACROSS THE U.S.

As the tradition of Juneteenth spread across the U.S., different localities put different spins on celebrations. In southern states, the holiday is traditionally celebrated with oral histories and readings, "red soda water" or strawberry soda, and barbecues. Some states serve up Marcus Garvey salad with red, green, and black beans, in honor of the black nationalist. Rodeos have become part of the tradition in the southwest, while contests, concerts, and parades are a common theme across the country.

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iStock // Ekaterina Minaeva
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technology
Man Buys Two Metric Tons of LEGO Bricks; Sorts Them Via Machine Learning
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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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iStock
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Live Smarter
Working Nights Could Keep Your Body from Healing
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iStock

The world we know today relies on millions of people getting up at sundown to go put in a shift on the highway, at the factory, or in the hospital. But the human body was not designed for nocturnal living. Scientists writing in the journal Occupational & Environmental Medicine say working nights could even prevent our bodies from healing damaged DNA.

It’s not as though anybody’s arguing that working in the dark and sleeping during the day is good for us. Previous studies have linked night work and rotating shifts to increased risks for heart disease, diabetes, weight gain, and car accidents. In 2007, the World Health Organization declared night work “probably or possibly carcinogenic.”

So while we know that flipping our natural sleep/wake schedule on its head can be harmful, we don’t completely know why. Some scientists, including the authors of the current paper, think hormones have something to do with it. They’ve been exploring the physiological effects of shift work on the body for years.

For one previous study, they measured workers’ levels of 8-OH-dG, which is a chemical byproduct of the DNA repair process. (All day long, we bruise and ding our DNA. At night, it should fix itself.) They found that people who slept at night had higher levels of 8-OH-dG in their urine than day sleepers, which suggests that their bodies were healing more damage.

The researchers wondered if the differing 8-OH-dG levels could be somehow related to the hormone melatonin, which helps regulate our body clocks. They went back to the archived urine from the first study and identified 50 workers whose melatonin levels differed drastically between night-sleeping and day-sleeping days. They then tested those workers’ samples for 8-OH-dG.

The difference between the two sleeping periods was dramatic. During sleep on the day before working a night shift, workers produced only 20 percent as much 8-OH-dG as they did when sleeping at night.

"This likely reflects a reduced capacity to repair oxidative DNA damage due to insufficient levels of melatonin,” the authors write, “and may result in cells harbouring higher levels of DNA damage."

DNA damage is considered one of the most fundamental causes of cancer.

Lead author Parveen Bhatti says it’s possible that taking melatonin supplements could help, but it’s still too soon to tell. This was a very small study, the participants were all white, and the researchers didn't control for lifestyle-related variables like what the workers ate.

“In the meantime,” Bhatti told Mental Floss, “shift workers should remain vigilant about following current health guidelines, such as not smoking, eating a balanced diet and getting plenty of sleep and exercise.”

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