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Will Rocco the Rock float? Will a leaf sink? Elmo, Zoe, Telly, and Gordon have fun along the way as they perform simple experiments to find the answers. Also in this episode: Global Grover returns from Nicaragua to explain how bricks are made, and an observant gardener lends a hand to some "Desperate Houseplants." This episode is brought to you by the letter P and the number 15.