Giant plumes of oil in Gulf: how BP will stop the flow

Over the weekend, BP made major headway in containing the flow of oil still leaking from the site of the Deepwater Horizon wellhead, which ruptured back on April 20. Since that day, oil has flowed into the gulf at a rate of at least 210,000 gallons a day, and some argue that the rate may be as high as 3,000,000. (For comparison, a standard gasoline tanker truck holds 9,000 gallons: Imagine a line of 24 tanker trucks pulling up to the Gulf every day, dumping their crude oil, and driving off.)