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Originally Posted By: Ardy
Originally Posted By: numan



Why did you have a wolf?
Maybe he seduced you with the idea that he was a wealth creator
The value of your goat will increase as he eats every other goat. Hmm

If that's a Mexican wolf and the river is the Gila, that wolf already crossed!


You never change things by fighting the existing reality.
To change something, build a new model that makes the old model obsolete.
R. Buckminster Fuller
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I think I would barbecue the goat and make some cole slaw with the cabbage. Then the wolf and I could have a great lunch before we part ways.

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The prosecution calls Gottfried Leibnitz.

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Originally Posted By: numan

The prosecution calls Gottfried Leibnitz.


ROTFMOL


"The liberals can understand everything but people who don't understand them."
Lenny Bruce

"The cleverest of all, in my opinion, is the man who calls himself a fool at least once a month."
Dostoevsky



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Quote:
So why isn't the sky violet?


The answer is pretty simple, but leads to an interesting area of human perception. We have three different color sensors in our eyes, all with broad wavelength response curves. When we perceive "yellow" that means our red cones and green cones are being stimulated in roughly equal amounts. We can perceive that same "color" by looking at a single pure wavelength of light halfway between the red and green cone's peak wavelengths, or we can perceive it by looking at two (or more) wavelengths of light that stimulate both red and green cones in equal amounts. (This leads to some very disturbing experiments with narrow-band filters and different light sources that look the same without the filters.)

Here's a website that has a graph of our cones' response to different wavelengths of light:
Blue is not Primary

If you look at the last of those plots, and imagine the Raleigh Scattering equation overlaid, the answer to the girl's question becomes obvious: The scattering does not produce discrete wavelengths of violet, blue, and green, but rather produces all wavelengths at attenuated intensities as the wavelength gets longer. We are sensing the violet, but we are also sensing some green. We perceive that combination as blue. It the scattering fell off more aggressively, then we would perceive the sky as violet. If it fell off much less aggressively, then we would perceive the sky as white.

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