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Daniel LeClair/Reuters

25 Times the Earth Tried to Swallow Us

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Daniel LeClair/Reuters

Sinkholes—those terrifying natural phenomena known for gulping down unsuspecting houses, bridges, or even Corvettes—have been a hot topic in the news lately. Most of these newsworthy cave-ins are of the "cover-collapse" variety, in which soil beneath the surface begins to shift downward, leaving behind an increasingly large air pocket beneath a thin bridge of soil that manages to hold together until one day it doesn't, and suddenly: sinkhole.

Unlike earthquakes and hurricanes, sinkholes cause damage that is usually concentrated in a single place: namely, the new, gaping opening in what used to be a grassy field or intact asphalt highway. This destruction is no picnic for residents of the surrounding area, but for everyone else, it serves as a fascinating reminder of the Earth's dangerous potential.

1. Ottawa, Canada

Blair Gable/Reuters

Ottawa residents were disappointed on February 21, 2014, when their proposed celebration of one year's construction work on a new light rail transit system turned into a press conference about the hole that put a halt to their plan. There's no official diagnosis of exactly what caused dirt to begin showering down on excavation crews working to clear an underground tunnel for transit, but it's a safe bet that all that digging around couldn't have helped. Gravity is a tricky force to manage, and with nothing beneath it for support, all that surface dirt needed somewhere to go: thus, a sinkhole.

2. Beijing, China

China Daily/Reuters

In another example of human construction projects gone awry, the city of Beijing found itself with a sinkhole on its hands after improper procedure caused an underground water pipe to burst. The 16-foot by 16-foot hole filled with water, diverting the supply for almost 300 households in the area and creating a very unappealing kind of urban swimming pool.

3. Xi'an, Shaanxi, China

Stringer/Reuters

A broken water pipe strikes again in another Chinese province, causing the collapse of a two-lane road—but, luckily, no casualties.

4. Clermont, FL

David Manning/Reuters

Disney World enthusiasts at Florida's Summer Bay Resort had their vacations rudely interrupted by a sinkhole in August 2013 that caused serious structural damage to two buildings housing roughly 105 people. Though their holiday guidebooks probably didn't warn them, Florida is no stranger to such upsetting events: the state's frequent rainfall makes its underlying bedrock more prone to dissolve even as the ground's surface remains intact, leading to a nasty surprise when what seemed solid just a minute before suddenly gives way. In this case, a quick-thinking security guard (who was probably up on his sinkhole science) reacted to reports of unexplained loud noises and cracking windows by evacuating all the guests, giving them plenty of time to get away from the disaster area safely.

5. Montreal, Canada

Christinne Muschi/Reuters

Though a sinkhole that can take down a construction vehicle seems plenty big, this interruption on Montreal's Saint-Catherine Street is a baby compared to the world's biggest sinkholes. The Qattara Depression just west of Cairo, Egypt measures 75 miles across at its largest point, a distance this tractor would have taken hours to travel.

6. Xi'an, Shaanxi, China

Stringer/Reuters

The frequency of sinkhole stories coming out of China has many of its citizens blaming the nation's emphasis on rapid urbanization coupled with inadequate training for construction workers, leading to a weak infrastructure that contributes to sinkholes like the one that swallowed a cement truck. Japan experienced a similar problem about 20 years ago, when hasty construction in Tokyo caused approximately 20 sinkhole disasters a year; since the city began more stringently investigating the underground landscape using radar technology, that number has dropped to about two per year.

7. Toledo, OH

Lt. Matthew Hertzfeld/Toledo Fire and Rescue/Reuters

Pamela Knox must have had the most interesting story to share around the dinner table on July 3, 2013, after she drove straight into a sinkhole that opened up right in front of her eyes. The driver ahead of her just managed to drive past the collapsing bit of roadway, but there was no way for Knox to do the same. She was, at least, able to climb up a ladder to the surface, shaken but unharmed.

8. Loudi, Hunan, China

China Daily/Reuters

A Chinese motorcyclist experienced another near-miss in a sinkhole that appeared in the wake of a large truck: the man fell in, but was rescued promptly and, while injured, survived.

9. Shenzhen, Guangdong, China

China Daily/Reuters

Not all sinkhole victims escape. Here, rescue workers retrieve a body from a caved-in roadway. Such deaths are rare, but when a sinkhole strikes, there's no way to avoid it: reported incidents from Beijing, Taiwan, Idaho, and Utah have all involved victims who were near-instantly lost when the ground gave way beneath them.

10. Chicago, IL

Jim Young/Reuters

"April showers" took a more sinister turn in Chicago last year. Instead of May flowers, they brought school closures, air travel delays, and a sinkhole that swallowed three cars. Major flooding in the South Side area put pressure on an old water main dating from 1915, which gave way and contributed to the rapid erosion beneath street level.

11. Xi'an, Shaanxi, China

China Daily/Reuters

Although no official cause was determined for this particular sinkhole, it's likely another run-of-the-mill case of erosive activity, poor construction, or broken pipes—unlike one tragic accident in Idaho caused by a vast network of gopher tunnels.

12. Toowoomba, Australia

Alicia Morrison/Reuters

Brisbane residents put up sandbags around their homes to prevent the onslaught of area flooding, but nothing could prevent a gaping sinkhole from forming just west of the city.

13. Schmalkalden, Germany

Alex Domanski/Reuters

Officials from the German town of Schmalkalden, population approximately 20,000, declared their intention to fill a sinkhole measuring 98 feet across and 65 feet deep with gravel. In most other instances, sinkholes in non-residential areas are usually left to their own devices; over time, sinkholes will usually self-correct by filling with eroded soil from the surrounding area. In some cases, the hole fills up with water instead, creating a pond.

14. Dachegnqiao, Ningxiang, Hunan, China

Stringer/Reuters

The worst sinkholes are the ones that aren't yet satisfied. Onlookers near the Dachegnqiao sinkhole were careful not to get too close, since the crater was already 492 feet wide at the time of this photo and continued to grow each day.

15. Les Arcs sur Argens, France

Sebastien Nogier/Reuters

Rainfall of around 14 inches in just a few hours and its location near Le Real River spelled sinkhole disaster for this town center.

16. Guatemala City, Guatemala

Daniel LeClair/Reuters

More than 94,000 people had to be evacuated in a sinkhole disaster of epic proportions caused by Tropical Storm Agatha in 2010. Rescue efforts on such a large scale were made even more difficult by the destruction of roads and highway bridges leading out of the city. There were significant casualties.

17. Caracas, Venezuela 

Miranda Government/Reuters 

In December 2010, thousands of Venezuelans were forced to flee their homes—and 21 people were killed—amid landslides and river flooding, which also contributed to this sinkhole in the Gran Marical de Ayacucho highway in the state of Miranda outside Caracas.

18. Hefei, Anhui, China

China Daily/Reuters

The 6-foot sinkhole here couldn't quite consume a building, but it easily took down a taxi and a few motorbikes, with one more car teetering on the edge.

19. Nachterstedt, Germany

Gemeindeverwaltung Nachterstedt/Reuters

A peaceful lakeside residence disappeared into the water one Saturday morning in an eastern German village. The "lake" was the converted remainder of an old coal mine, and this instability may account for the 350 meters of shoreline that disappeared along it.

20. Guangzhou, Guangdong, China

REUTERS/China Daily

Another car fell prey to a sudden road collapse in China's Guangdong province, but no casualties were reported. Although this is a fairly shallow hole, the Chinese have a special name for extremely large craters exceeding 820 feet in depth and/or width: "tiankengs," or "sky holes."

21. San Sebastián, Spain


Vincent West/Reuters

A 2008 storm along the Bay of Biscay, on the Spanish coast near the French border, sunk boats moored along the Paseo Nuevo, or "New Promenade."

22. Guatemala City, Guatemala

Stringer/Reuters

A smaller sinkhole than the one that put Guatemala's capital city in global headlines in 2010, this 2007 crater nonetheless consumed a number of homes and resulted in three residents reported missing.

23. Nagapattinam, India

Punit Paranjpe/Reuters

This shot of Indian locals looking suspiciously into the pit left behind by tsunami damage in 2004 demonstrates an appropriate level of wariness when dealing with sinkholes: in the same way that lightning (despite the old adage) is more likely to strike the same location multiple times, the presence of one sinkhole often indicates an area's overall unstable topography, which may contribute to even more unpleasant geologic surprises in the near future.

24. Gallipoli, Italy

Fabio Serino/Reuters

Italy is one of a handful of countries around the world whose karst topography—that is, land dominated by water-soluble rocks like limestone, which easily dissolve to create irregular landscapes—makes it susceptible to sinkholes born of natural causes. Florida is one of the United States' most notable karst areas; other such vulnerable regions include Mexico, Belize, China, Russia, Slovenia, and Croatia.

25. Nanchang, Jiangxi, China

China Daily/Reuters

Sinkholes don't often have such neat edges as this collapsed segment of Shunwai Road in Nanchang. Officials announced plans to investigate causes of the cave-in, but sinkholes can be as unknowable as they are dangerous.

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iStock // Ekaterina Minaeva
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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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Here's How to Change Your Name on Facebook
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Whether you want to change your legal name, adopt a new nickname, or simply reinvent your online persona, it's helpful to know the process of resetting your name on Facebook. The social media site isn't a fan of fake accounts, and as a result changing your name is a little more complicated than updating your profile picture or relationship status. Luckily, Daily Dot laid out the steps.

Start by going to the blue bar at the top of the page in desktop view and clicking the down arrow to the far right. From here, go to Settings. This should take you to the General Account Settings page. Find your name as it appears on your profile and click the Edit link to the right of it. Now, you can input your preferred first and last name, and if you’d like, your middle name.

The steps are similar in Facebook mobile. To find Settings, tap the More option in the bottom right corner. Go to Account Settings, then General, then hit your name to change it.

Whatever you type should adhere to Facebook's guidelines, which prohibit symbols, numbers, unusual capitalization, and honorifics like Mr., Ms., and Dr. Before landing on a name, make sure you’re ready to commit to it: Facebook won’t let you update it again for 60 days. If you aren’t happy with these restrictions, adding a secondary name or a name pronunciation might better suit your needs. You can do this by going to the Details About You heading under the About page of your profile.

[h/t Daily Dot]

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