Slipstick funnies: in case of power-outage...

SlideRule

Rodney sez, "Wayne Pollock, a Computer Science instructor at Hillsborough Community College (FL), has this on his office wall. He says, 'I had that idea years ago, and my dad made the darn thing one year as a gift.'" Read the rest

Elegance, illustrated: heliocentrism vs geocentrism

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In a gorgeous animation, Malin Christersson shows how much simpler it is to plot out celestial mechanics when you assume that all the bodies in our solar system are in orbit around the sun, rather than the other way around. Read the rest

The iPhone of slide rules

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I have vague memories of my older scientist brother Mark wearing a slide rule in a leather case on his belt. It was really one of the first wearable computers, albeit a mechanical, analog one. Then in 1974, he was able to purchase a Texas Instruments SR-50, the first mass-market commercial electronic calculator. The slide rule was buried in Mark's desk drawer, where the SR-50, and later his Sharp Wizard, Palm Pilot, and their descendants would ultimately end up as well. (Mark died wearing a calculator wristwatch!)

In this episode of Numberphile, Alex Bellos explains the seduction of the slide rule and also the Halden Calculex, a device he calls the "iPhone of Slide Rules."

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Watch this elegant dance of triangles by animator René Jodoin (1966)

From 1966, René Jodoin's beautiful minimalist animation of a geometric ballet, "Notes on a Triangle." Jodoin, who died earlier this year, was founder of the National Film Board of Canada's animation studio. "Note on a Triangle" was only one of several films meant as an introduction to geometric forms. See more here.

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The moral character of cryptographic work

Bertrand Russel- Albert Einstein

Phillip Rogaway, an eminent computer scientist and cryptographer at UC Davis, has made a stir in information security circles with a long, thoughtful paper called The Moral Character of Cryptographic Work. Read the rest

World's greatest math test answer

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I hope the teacher didn't mark it wrong. [via] Read the rest

Upvote this: Teach kids in underserved communities how to code with Minecraft

Camp Minecraft. The goal: Bring it to more kids whose families can't pay.

LA Makerspace co-founder Tara Tiger Brown shares a project that her kid-friendly maker workshop is trying to make a reality.

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Why students are forced to buy this expensive and obsolete Texas Instruments calculator

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Twenty years ago, Texas Instruments released the TI-83 graphing calculator, a stupidly expensive piece of old technology that most high schools still require their juniors and seniors buy for around $100. Why? Because. That's why. From Mic.com:

Pearson textbooks feature illustrations of TI-series calculators alongside chapters so students can use their TI calculator in conjunction with the lesson plan. The calculators also have a significant learning curve, and moving students over to new technology is a risky proposition when success in the classroom is so tied to the technology being used.

TI calculators have been a constant, essential staple in the slow-moving public education sector. Students and teachers are so used to generations of students learning the familiar button combos and menu options that TI provides a computer program that perfectly resembles the button layout of the TI-83.

However, even if teachers wanted to be bold and bring in better technology, they would end up right back at square one because of that infamous force in American education: standardized testing.

College Board and other companies that administer the country's standardized tests have approved lists of calculators. TI-series devices are ubiquitous — mobile apps are nowhere to be found.

"I'm actually at the point now where when I do parent conferences, I tell the parents it's in their students' best interest to buy one, because the device will become necessary," Bob Lochel, a math teacher in Hatboro, Pennsylvania, told Mic. "But you feel dirty, because you're telling parents they need to buy a device, and I know I can teach without it."

"Remember Your Old Graphing Calculator? Read the rest

Podcast: Effective Altriusm interview with the author of "Doing Good Better"

Rick Kleffel talks to William MacAskill, the core of Effective Altruism, discussing EA and his book about it. It's much more pragmatic and entirely reasonable, not about extreme statistics and speculations." Read the rest

Why the United States refuses to go metric

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"Let's be bold -- let's join the rest of the world and go metric," said Democratic presidential candidate Lincoln Chafee when he announced his bid for the Oval Office. CNN interviews John Bemelmans Marciano, author of Whatever Happened to the Metric System?, about why the US is the only industrialized nation not to use the metric system in business, or most other fields. (Above, U.S. Office of Education public service announcement from 1978.) From CNN:

"People say the metric system makes sense," Marciano says, "But in nature we don't think about dividing things by 10, do we? We think of halves and feet and thirds."

Acres, for instance, were based on the amount of land a man could plow in a day.

"Throughout history we have measured things by ourselves," Marciano says. "We are really losing something with metric."

And another thing: People think the metric system has something to do with science. It doesn't, Marciano says, except that it is used in science and every scientist will probably put forth a convincing argument for why it's silly not to be metric.

"That's the biggest misconception," Marciano says. "The metric system has everything to do with capitalism. It's all about a selling system."

"Refusing to Give an Inch" (CNN)

Whatever Happened to the Metric System?: How America Kept Its Feet (Amazon)

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Donald Duck taught me how to play billiards

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Before the age of YouTube, you cherished the chance to see a rerun—and you had to take notes.

The geometry of fireworks

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“Enjoy the parabolic envelopes that form while those bright, sparkling, parabolic curves are etched into the sky tonight.”

Video: HOWTO put a Rubik's Cube in a bottle

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YouTuber Mathologer shares his technique for reassembling a Rubik's Cube inside a glass container. The secret? Magnets! Read the rest

Statistics Done Wrong: The Woefully Complete Guide

From a brilliant Web-rant to an indispensable guide to the perils of statistics and their remedies, Alex Reinhart's Statistics Gone Wrong is a spotter's guide to arrant nonsense cloaked in mathematical respectability.

This 'numerical sledding game' is like Skifree, but with math

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If you like math, puzzles or winter sports, you need to play Sinerider, a sledding game where you transform the slope with math equations. Read the rest

3D printed blooming Fibonacci zoetropes

Stanford design prof John Edmark, as part of his artistic residency at Autodesk, created these 3D printed "blooming" Fibonacci-sequence zoetropes, which seem to grow, writhe, and pulse as they're spun before a camera shooting every 1/4000 of a second. Read the rest

How to have mind-boggling fun with infinity

The human brain is happy working with nice finite numbers. As soon as you start working with infinity, things start happening that are completely counter-intuitive.

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