Take a close look at the water in your local marina and you'll probably shudder at the amount of waste floating around. You'd practically need a dedicated clean-up crew to make it safe, wouldn't you? However, a pair of Australian surfers think they have a better way. Their crowdfunded Seabin promises to clean up marinas (and by extension, the ocean) through the one-two combo of a natural fiber garbage bin and an automated, above-the-water pump. It's almost too simple a concept, but it seems to work -- it sucks in all kinds of filth (including oil) and spits out clean water. You'd ideally leave a bunch of Seabins running at the dock all day, keeping the water relatively pristine.