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One good site
MDN
Nelson Minar
Blog licensed under a Creative Commons License
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San Francisco lets its lazy residents throw all recyclables into a
single bin; they sort it later.
Jon Carroll explains
how it works.
What you have is sort of like a conveyor belt except, for reasons not
fully understood by this correspondent, it separates the trash, with
the lighter paper crawling upward and eventually off the top of the
screen, while the heavier cans and bottles and whatnot slide downward
onto another conveyor belt.
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