Waterworld star Kevin Costner is helping BP clean up the oil slick that's spreading across the Gulf of Mexico.

For the past 15 years, Costner has been funding a team of scientists in hopes of developing a technology to clean up massive oil spills -- he first got interested around the time of the Exxon-Valdez disaster.

Who knew?

Costner and his brother Dan have invested millions of dollars in Ocean Therapy Solutions, a company that's invented a $24 million centrifuge machine called Ocean Therapy, which can purportedly separate oil from water and clean up over 200,000 gallons of seawater a day.

BP spokesman Mark Proegler says that the company has agreed to test the machine.

Let's hope it works. Government scientists estimate that a minimum of 210,000 gallons of oil per day is gushing into the sea from the remains of the Deepwater Horizon oil platform that exploded April 20. BP has tried several ways to stop the leak, including containment domes, but none has worked so far.