Discovery News' David Teeghman runs through four of the relatively feasible schemes suggested to combat the Gulf oil spill. You'll find one of them, the oil-blocking water filter, discussed on TechNewsDaily as well. Another high-profile idea, actor Kevin Costner's oil-sucking whirligig, was fielded by my msnbc.com colleague Kari Huus. If you build it, will it run?
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