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81 USB Chargeable Batteries Philip Proefrock 26424
82 Fuel Cell to Power Portables 24797
83 Switching from Batteries to Portable Power Generation Philip Proefrock 20945
84 300 Watt-Hours per Kilogram! Hank Green 25841
85 Plastic Battery: Instant Recharge Hank Green 24789
86 Intventor of LEDs Wins Millenium Prize Hank Green 20187
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