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Jon Knutson
Let me noodle on it.
Let me noodle on it.

Jon's posts

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Wow, the founding thieves at Otto sound like a perfect fit for the Uber(dicks)®.

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Shame on +VIZIO USA​. I thought they were a good company. Unplugged.
_What made the breach of customer trust particularly egregious was the fact that Vizio was doing this whether the end-user agreed to it or not._ 

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That's pretty amazing. I might have to stop making fun of TV shows and movies when they "enhance" grainy imagery.
h/t +Emlyn O'Regan​
Algorithm that increases the resolution of images, synthesizing additional details as needed based on its understanding of what e.g. human faces should look like. Left is an 8x8 input, middle is the enhanced 32x32 version, right is what the 8x8 input originally looked like at 32x32 size.


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What happens when a bullet hits an 'unbreakable' Prince Rupert's drop?
For those of you who aren't familiar with the Prince Rupert's drop, this weird, scientific enigma is a glass object that's created by dripping molten glass into very cold water.
Is a teardrop-shaped piece of glass that's pretty much unbreakable at its bulbous 'drop' end, but which shatters from the slightest pressure at the elongated tail end. Scientists have been obsessed with them since the 1600s. But what happens if you shoot one with a bullet?

In glorious slow motion, you can watch as the bullet bounces right off the wide end of the drop, sending out shock waves that then rattle the rest of the structure and cause the thin end to break, resulting in the entire thing exploding.

When the Prince Rupert's drop is made, molten glass is poured into extremely cold water, causing the outside of the drop to cool and solidify almost instantly, while the inside remains molten and cools more slowly.

Because of thermal expansion, glass wants to expand while it's hot, and contract while it's cool.

That means that as the molten inside of the glass gradually cools down, it wants to contract and pull the solid outer layer inwards. But because the outer layer is already solidified, this just makes the whole thing tighter, making that bulbous end of the Prince Rupert's drop pretty much indestructible, and, as we now know, bullet-proof.

But because the outside of the glass is in extremely high compressive stress, and the inside is in extremely high tensile stress, if one link is ever broken, then the whole thing explodes, feeding off its stored internal energy.

This is what happens when the fragile thin end at the back of the drop gets broken - it releases all that pent-up energy and causes the whole thing to shatter.

Video source via Smarter Every Day:

Story via ScienceAlert

What is Prince Rupert's Drop anyway?:

#physics   #science   #princerupertdrop  
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Here's a fun brain failure (optical illusion) for you.
+Jens Knutson+Samantha Karsten+Gary Virta

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»From Stanislaw Lem's "Return from the Stars" published in 1961:
<Kindle shows:>The books were crystals with recorded contents. They could be read with the aid of an opton, which was similar to a book but had only one page between the covers. At a touch, successive pages of the text appeared on it.</>«

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Proud of President Kaler and the U of M for sticking to their values on this. No charges filed by DA does not mean no crime; it means they don't think they have enough to win. Furthermore, no crime doesn't always mean no wrong done. As Kaler said, "this is more important than a bowl game." The more we let our athletes get away with these types of things, the worse they get. And shame on the alumni and donors who tried to use their money to put "The Program" ahead of what's right. They're part of the problem.

The attached letter is very well put.

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Last year I got up-close and personal with a couple of manatees in Crystal River. It was an amazing experience, but more than that, they are very important to the ecosystem of the area, as they are the only thing keeping the sea grass in check, literally grazing on it as befits their "sea cow" nickname.

To the guy who says that "even the 'big, bad boaters' like manatees", I don't think anybody is claiming boaters are trying to kill manatees; we don't have lower speed limits in school zones because people are trying to run down children with cars either.

That being said, it could be good to know what is working to help the manatees, so we can make sure we keep doing that. Unfortunately, and contrary to the headline, this article doesn't actually examine "why" the Florida manatee population is rebounding.

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If you like Honda vehicles, like I do, this is exciting news. Honda often lags behind in new features and tech. Maybe this means Honda won't be five years behind other auto manufacturers when it comes to autonomous vehicles.

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