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25 Things You Might Not Know About Sledding

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Initially developed to haul loads over snowy terrain, sleds quickly evolved into recreational devices. I can fondly recall many a snow day spent hurtling down the hill in my backyard, inevitably ending up in the hedge, and emerging, scratched and exhilarated, ready for another go. I'm sure many of you have similar memories. So without further ado, here are a few things you might not have known about the history of sledding; many of these facts came from Brice J. Hoskin’s The Sled Book: Notes Concerning Winter’s Favorite Pastime.

Toboggans


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1. The word toboggan comes from either the Algonquin word odabaggan or the Anishinabe word nobugidaban.

2. The Inuit made their toboggans out of whalebone, while other tribes used birch or tamarack. The sleds had a curved front, to ease traveling over difficult terrain, but had no runners. The design has changed little since they were first developed; today, most toboggans are made with seven boards of ash or maple, each about 2 inches wide.

3. The Russians built the first toboggan slide—a high wooden structure with an ice-covered chute—in St. Petersburg in the late 1800s.

4. Tobogganing as a sport began in Canada in the late 1800s and quickly spread. Though it was considered a "sport," tobogganing was also high-fashion: Men wore top hats and ladies donned their best clothes for trips down the chute.

Kicksleds


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1. When an unknown inventor took a timber sled—which was used to haul wood out of the forest—and added a handlebar and put iron on the runners, the kicksled was born. They were first mentioned in a Swedish newspaper in 1870.

2. Another name for a kicksled is "spark." (The word for kicking in Scandinavian languages is sparke or sparka.)

3. "Kicksled" is a direct translation of the Finnish word potkukelkka.

4. The first kicksledding club was founded by Captain Victor Balck, one of the original members of the International Olympic Committee, in Stockholm in 1899.

5. Kicksleds can only be used on hard, slippery surfaces, which makes them particularly good for traversing frozen lakes.

6. Average kicksled speed in a race: 18mph.

Bobsleds


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1. An unknown inventor created the bobsled by adding a steering mechanism to a toboggan.

2. The sled gets its name because early competitors thought it helped to "bob" their heads on straightaways. (They were wrong—staying low makes the sled go faster.)

3. There are two variations on the bobsled. The skeleton, introduced in 1892, is a metal one-person sled that a rider drives lying head-first. The luge is a one or two person sled that puts riders feet first; they steer by pulling straps attached to the runners. The luge replaced the skeleton in the 1964 Olympics.

4. Top speed in bobsled on a modern course: 80mph.

5. A four-man bobsled race was an event in the first Winter Olympics, held in France in 1924. Only men competed until 2002, when two-woman teams were allowed to compete.

6. Bobsledding has been a part of every winter Olympics except for the 1960 Olympics in Squaw Valley, California; too few teams expressed an interest in competing.

7. There are two recreational bobsled tracks in the United States, both at the sites of past Olympic games: Park City, Utah, and Lake Placid, New York. They sleds go through the courses in under a minute, and riders will experience up to 5gs (astronauts experience 3gs on liftoff).

American Clippers and Cutters


Image courtesy Collector's Weekly.

1. Clippers and cutters were the first mass-produced sleds in the United States. They were made by the Paris Manufacturing Company in South Paris, Maine. The company was founded by Henry Morton in 1861; it was also the first company to commercially produce skis.

2. Morton based his sled designs on horse-drawn sleighs.

3. Yankee Clippers have runners that are upturned in the front; they're meant to be ridden face-first. Cutter sleds were longer, with runners that curved over the front of the sled. They were designed to be ridden sitting down. Both were difficult to steer.

4. The most famous sled in pop culture is Citizen Kane's Rosebud—a Yankee Clipper.

The Flexible Flyer


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1. The flexible flyer was patented by Samuel Leeds Allen in 1889. Allen was a prolific inventor who held almost 300 patents; he developed the sleds to keep the workers at his farm equipment factory busy in the off-season.

2. The sled had a slatted wood seat and steel runners which were weakened at one point halfway back with something that resembled a hinge. It was moderately steerable, and worked best on hard snow or ice.

3. In 1915, around 120,000 flexible fliers were sold, with an average of 2000 sold per day. The smallest went for $2.50; the largest, which was 8.5 feet long, weighed 41 pounds and could hold six adults, sold for $12.

4. In 1928, six flexible flyers went to the South Pole with Admiral Richard E. Byrd.

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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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