Helicopters on Mars may sound like something from a science fiction novel — or perhaps just a typical "Doctor Who" episode. But actually, they're not fully confined to the world of sci-fi; after all, ...
Morning Overview on MSN
Helicopters dump 6,000 logs into rivers to undo 40 years of damage
In the forests and canyons of the Northwestern US, helicopters are now doing something that would have horrified river engineers a generation ago: dropping thousands of tree trunks straight into the ...
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