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- HotTug: A Floating Hot Tub and an Electric Motorboat All-in-One! Sat, 8 Dec 12, 6:00amRead the rest of HotTug: A Floating Hot Tub and an Electric Motorboat All-in-One! Permalink | Add to del.icio.us | digg Post tags: green design, HotTug, hybrid boat, hybrid vehicles, nautical design, roterdam design,...