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"We intend to double our efficiency next year and the year after as well," Debroca said. "Going from 20 percent more battery life to 50 percent is a rational objective."

To date we've explored less than 5 percent of the world beneath the waves. So what's in the other 95 percent? Is it possible that by some chance we've already found all of the exciting stuff, or is the ocean full of surprises?

Ron Finley plants vegetable gardens in South Central LA -- in abandoned lots, traffic medians, along the curbs. Why? For fun, for defiance, for beauty and to offer some alternative to fast food in a community where "the drive-thrus are killing more people than the drive-bys."