Human Powered
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61 Weight to Watts Hank Green 14171
62 Ktrak SnowBike Hank Green 14207
63 The Best of the Best: Folding Bikes Hank Green 174565
64 Pull-String Power Hank Green 14738
65 Pedal Powered Laptop Hank Green 13914
66 Pedestrian-Generated Power Philip Proefrock 15469
67 DIY Human-Powered Tic Tac Light Hank Green 14217
68 Gerbil Wheel Elevator Hank Green 12551
69 Portable Squeeze Charger Hank Green 12849
70 A wind-up flashlight from Freeplay 12749
71 Gore v. Clinton in 08? Dave Burdick 12937
72 When you move, it's electric Dave Burdick 12756
 
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