And now these notebooks are coming for your serverless, & software defined infrastructure! It's this space: Cattle vs. Pets analogy now officially updated to add hives of bees for things like AWS Lambd., And to that I say, #OmgBees! Now the notebook/rest services need to meet with the configurable front-end http gateways that facade the inner network services (vulcand, vamp-router, &c &c).
Less technically minded but way more focus on the civil service these new approachable compute systems are offering- gave an overwhelmingly awesome review of the open source O'Reilly Learning efforts, Jupyter for Education: Beyond Gutenberg and Erasmus, talking about learning architectures, creating reference architectures that other organizations can also deploy- featured is a git backed content-platform Atlas and a toolset Thebes for integrating and productionizing notebooks for consumption. Beautiful work in progress that is absolutely at the crux of learning architectures of the future. I salute you O'Reilly Learning! #CodeIsMedia, and you are changing the game such that people can imminently grasp that, just as you are helping them grasp code!
See blog post http://amundsen.com/blog/archives/1166
Eye color comes primarily from a layer of the iris called the stroma. It sits in front of the epithelium, a brown layer which reflects and scatters light back through the stroma a second time. In brown-eyed people, the stroma contains melanin and so colors the light brown as it passes through. In blue-eyed people, the stroma is completely transparent – but light gets scattered by tiny particles floating within the stroma, and it acquires a blue color via the Tyndall effect. (Hazel and green eyes sit between these extremes, combining the two colors)
The Tyndall effect is similar to the Rayleigh effect which makes the sky blue. Essentially, when light gets scattered off things, blue light is bent more sharply than red light. When sunlight is bounced off the atmosphere, only the light which was bent the most sharply reaches our eyes (except when you're staring almost directly at the Sun); that means that what we see in the sky is blue light, even though the sky itself is transparent. The Tyndall effect is the same sort of property, when instead of bouncing off the sky, you're bouncing off fine particles suspended in a liquid; it's what makes glass look blue from the side, or flour suspended in water seem blue.
One interesting side effect of this: unlike the melanin which creates brown colors, the Tyndall effect is based on scattering the light which hits the eye, and so the color it produces depends a lot on the color of surrounding light. This is why lighter-colored eyes, in particular, tend to have hues which vary a lot from day to day, while brown colors remain more fixed.
Grey eyes come from a third phenomenon: some people have excess collagen in their stromata, which prevent the small particles needed to create the Tyndall Effect from floating around freely. Instead, all colors of light get scattered equally, and the resulting light is grey.
So to sum up, there are three mechanisms and two knobs which create eye color: the Tyndall effect makes your eyes blue (unless you have collagen, which replaces blue with grey), and melanin in your stroma adds a brown color on top of that.
h/t for the find.
If you want to see more about the Tyndall effect, start here: https://en.wikipedia.org/wiki/Tyndall_effect
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