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Rob Giseburt
991 followers -
Husband, father, and tinkerer, in that order.
Husband, father, and tinkerer, in that order.

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Originally shared by ****
Surprising Hyperuniformity in Bird Retinas

+Natalie Wolchover is one of the best science writers around and she knocks it out of the park again with another brilliant piece over at Quanta discussing the hidden, non-regular, non-random pattern known as hyperuniformity that is present in the distribution of cone cells in bird retinas https://www.quantamagazine.org/20160712-hyperuniformity-found-in-birds-math-and-physics/.

Birds have had the longest time to evolve better colour vision and this hyperuniform pattern on bird retinas, this pattern of the five differently sized colour-sensitive cone cells, the individual distribution of which is neither too close nor too far apart, appears to have been strongly selected for.

The pattern appears to be an optimised solution to a packing problem that must balance the constraints of packing differently sized cells as tightly as possible while ensuring uniform distribution, and contributes to birds having such fantastic vision.

But read the full piece for more detail and some counter-intuitive technological applications for hyperuniform materials distribution.

There was a release from Princeton regarding this work in early 2014, https://www.princeton.edu/main/news/archive/S39/32/02E70/index.xml?section=topstories, although the original discovery dates back much earlier as hinted at in Natalie's article.
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Be cautious y'all. 100% of people who ingest this eventually die. This stuff is everywhere. And beware the version you get get off the streets because it's pretty much guaranteed to be full of additives.
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Was just trying to explain this to the kids today...
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Nice. I use constexpr to great benefit in embedded (bare metal) C++. Things like register pointers make great constexpr. Better yet, they make great alternatives to macros in many cases.
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As some of you know I am a member of the Synthetos team working on TinyG and G2 Core. We're often asked about our advanced motion control, so we worked this up to explain it. Enjoy!
TinyG and G2 Core use 7th-order jerk-controlled motion planning in real-time. Other motion control systems (both open-source and most proprietary) use constant acceleration motion planning for real-time applications. This page explains what those terms mean, and the differences and benefits of controlled-jerk motion planning. [Click the image to read more.]
TinyG
TinyG
github.com
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We wanted to explain in clear (non-math) terms what our motion control is like. This is the result. We hope it helps explain what's happening in there somewhat. :-)
TinyG and G2 Core use 7th-order jerk-controlled motion planning in real-time. Other motion control systems (both open-source and most proprietary) use constant acceleration motion planning for real-time applications. This page explains what those terms mean, and the differences and benefits of controlled-jerk motion planning. [Click the image to read more.]
TinyG
TinyG
github.com

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If you collect #stupidErrorMessages, here's one courtesy usps.com.
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My "Battlebits" project was a hit at Shmoocon! @hackaday gave us a killer write up. Source code + plans coming shortly. I was amazed at how many people want to make one. Oh the one thing HaD did not mention was its all based off of MQTT protocol on the back end. Its a killer protocol and it was a great weekend #shmoocon


https://hackaday.com/2016/01/17/the-best-conference-booth-youll-ever-see/
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Shmoocon is here, and that means a dozen or so security companies have bought a booth and are out to promote themselves. Some are giving out shot glasses. One is giving out quadcopters. It is exceedingly difficult to stand out in the crowd. At least one…
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