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A Brief History of the High Five

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Since 2002, the third Thursday of April is recognized as National High Five Day—a 24-hour period for giving familiars and strangers alike as many high fives as humanly possible. A few University of Virginia students invented the day, which has since evolved into a “High 5-A-Thon” that raises money each year for for a good cause. (For 2017, it's CoachArt, a nonprofit organization that engages kids impacted by chronic illness in arts and athletics.) Here are a few more facts about the history of the hand gesture to get you in the high-fiving spirit.

UP HIGH

That may sound like a lot of celebration for a simple hand gesture, but the truth is, the act of reaching your arm up over your head and slapping the elevated palm and five fingers of another person has revolutionized the way Americans (and many all over world) cheer for everything from personal achievements to miraculous game-winning plays in the sports world. Psychological studies on touch and human contact have found that gestures like the high five enhance bonding among sports teammates, which in turn has a winning effect on the whole team. Put 'er there!

DOWN LOW

There is some dispute about who actually invented the high five. Some claim the gesture was invented by Los Angeles Dodgers outfielder Glenn Burke when he spontaneously high-fived fellow outfielder Dusty Baker after a home run during a game in 1977. Others claim the 1978-79 Louisville basketball team started it on the court. Since no one could definitively pinpoint the exact origin, National High Five Day co-founder Conor Lastowka made up a story about Murray State basketballer Lamont Sleets inventing it in the late '70s/early '80s, inspired by his father's Vietnam unit, “The Fives.”

Regardless of which high-five origin story is more accurate, there is little question of its roots. The high five evolved from its sister-in-slappage, the low five. The gesture, also known as “slapping skin,” was made popular in the jazz age by the likes of Al Jolson, Cab Calloway and the Andrews Sisters.

GIMME FIVE

As the high five has evolved over the past few decades, variations have developed and become popular in and of themselves. Here are five popular styles:

The Baby Five
Before most babies learn to walk or talk, they learn to high five. Baby hands are much smaller than adult hands, so grownups have to either use one finger, scrunch their fingers together or flat-out palm it.

The Air Five
Also known as the "wi-five" in the more recent technology age, this one is achieved just like a regular high five, minus the hand-to-hand contact. Its great for germaphobes and long distance celebrations.

The Double High Five
Also known as a “high ten,” it is characterized by using both hands simultaneously to high five.

The Fist Bump
It's a trendy offshoot of the high five that made headlines thanks to a public display by the U.S. President and First Lady. Instead of palm slapping, it involves contact between the knuckles of two balled fists. In some cases, the fist bump can be “exploding,” by which the bump is followed by a fanning out of all involved fingers.

The Self High Five
If something awesome happens and there's no one else around, the self high five may be appropriate. It happens when one person raises one hand and brings the other hand up to meet it, high-five style. Pro-wrestler Diamond Dallas Page made the move famous in his appearances at WCW matches.

YOU'RE TOO SLOW!

Don't fall for that old joke. The key to a solid high five is threefold. Always watch for the elbow of your high-fiving mate to ensure accuracy; never leave a buddy hanging; and always have hand sanitizer on you. Have a Happy High Five Day!

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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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May 23, 2017
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