Raft, simplest type of watercraft, made up of logs or planks fastened together to form a floating platform. The earliest were sometimes made of bundles of reeds. Most rafts have been designed simply to float with the current, but they can be equipped with oars or sails or both and can be navigated in the ocean over long distances, as was dramatically demonstrated by Norwegian scientist Thor Heyerdahl in 1947;http://www.electric-supboard.c....om/stand-up-paddle-b
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