Science

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May 06

Why do tumbleweeds tumble?

Tumbleweeds might be the iconic props of classic Westerns. But in real life, they’re not only a noxious weed, but one that moves around.

Meet one of the Internet's most prolific distributors of hyper-partisan fare. From California, Cyrus Massoumi caters to both liberals and conservatives, serving up political grist through various Facebook pages. Science correspondent Miles O'Brien profiles a leading purveyor of junk news…