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How to Escape from Quicksand

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Thinkstock

Despite what every corny '70s adventure flick may have led you to believe, you’re unlikely to run into quicksand in your day-to-day life. However, quicksand is still somewhat common near rivers, estuaries, and marshes, so it’s worth knowing how to get out. If you’re hiking alone and get that sinking feeling, don’t panic. Unless the tide rolls in while you’re stuck, you should be able to escape to safety.

1) Calm Down!

Forget what you’ve seen in movies - you’re not going to be sucked into a bottomless pit. Even in the deepest quicksand, you won’t sink far past your midsection. The human body is just too buoyant. So take deep breaths. The more air you have in your lungs, the better you’ll float like a human cork.

2) Toss Your Gear

All that extra weight will make you sink faster. Ditch your backpack and try wriggling out of your shoes. They will make escaping more difficult (boots in particular become stubborn suction cups when in mud.)

3) Don’t Move

Resist the urge to wiggle your legs. Quicksand is what’s known as a non-Newtonian fluid, so it liquefies whenever there’s movement. As you sink, your weight pushes water from the sand. With the water gone, the sand thickens, creating a vacuum that tugs you down.

4) Okay, Now Move

You’re sinking because the sand around your legs has lost water. But if that water can return, the sand’s grip should loosen. That’s your route to escape—and the only way to do that is to move.

5) Put Your Back Into It

Time to redistribute your weight. If you’re ankle or knee deep, slowly sit down. If you’re waist deep, lean on your back. Don’t panic about sinking—a pit of quicksand is like a swimming pool. You’ll sink if you stand, but you’ll float if you spread out on your back.

6) Time to Shake a Leg

With your upper body now serving as a counterweight, you can start pulling your legs out. Wiggle one leg in small circles and pull. Water will slowly flood the sand around you, weakening the quicksand.

7) Perfect Your Forward Crawl

Removing your leg in one fell swoop would require as much force as it does to lift a mid-sized car, so take your time. It may take a while to remove your leg, but you’ll get it out eventually. Once both limbs are free, gently flip onto your belly and crawl to solid safety.

Now that you’re free of the quicksand, you’ve got a story that you can use to wow your friends for the rest of your life. But you’ve also earned a reward. We may be biased, but we think a cold Dos Equis would be the perfect way to cool down after all that leg-pulling work.

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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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Nick Briggs/Comic Relief
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What Happened to Jamie and Aurelia From Love Actually?
May 26, 2017
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Nick Briggs/Comic Relief

Fans of the romantic-comedy Love Actually recently got a bonus reunion in the form of Red Nose Day Actually, a short charity special that gave audiences a peek at where their favorite characters ended up almost 15 years later.

One of the most improbable pairings from the original film was between Jamie (Colin Firth) and Aurelia (Lúcia Moniz), who fell in love despite almost no shared vocabulary. Jamie is English, and Aurelia is Portuguese, and they know just enough of each other’s native tongues for Jamie to propose and Aurelia to accept.

A decade and a half on, they have both improved their knowledge of each other’s languages—if not perfectly, in Jamie’s case. But apparently, their love is much stronger than his grasp on Portuguese grammar, because they’ve got three bilingual kids and another on the way. (And still enjoy having important romantic moments in the car.)

In 2015, Love Actually script editor Emma Freud revealed via Twitter what happened between Karen and Harry (Emma Thompson and Alan Rickman, who passed away last year). Most of the other couples get happy endings in the short—even if Hugh Grant's character hasn't gotten any better at dancing.

[h/t TV Guide]

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