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Got Milk? How?
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Ultrasonic Frogs Raise the Pitch
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Pollution at the ends of the Earth
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Lost Sight, Found Sound
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Sugary Survival Skill
A Light Delay
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Electronic Paper Turns a Page
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2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
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A Volcano's Deadly Ash
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Fishing for Fun Takes Toll
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Stonehenge Settlement
A Volcano's Deadly Ash
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Electric Ray
A Grim Future for Some Killer Whales
Perches
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A Pepper Part that Burns Fat
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Building a Food Pyramid
GSAT English Rules
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Whoever vs. Whomever
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GSAT Exam Preparation Jamaica
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
Ministry of Education Announces 82 GSAT Scholarships for 2010
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Exams Jamaica Scholarships
Results of GSAT are in schools this week
42,000 students will sit for the GSAT Exam in two weeks
GSAT stars reap scholarship glory
GSAT Mathematics
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Detecting True Art
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Hear, Hear
Don't Eat That Sandwich!
Surviving Olympic Heat
Invertebrates
Corals
Lice
Sea Anemones
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African Wild Dog
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Kangaroos
Parents
Raise a Lifelong Reader by Reading Aloud
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Choosing a Preschool: What to Consider
Physics
Einstein's Skateboard
The Pressure of Scuba Diving
Gaining a Swift Lift
Plants
Fastest Plant on Earth
Seeds of the Future
White fuzzy mold not as friendly as it looks
Reptiles
Komodo Dragons
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Crocodiles
Space and Astronomy
Phantom Energy and the Big Rip
World of Three Suns
Baby Star
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Musclebots Take Some Steps
Space Umbrellas to Shield Earth
Shape Shifting
The Parts of Speech
What is a Preposition?
Countable and Uncountable Nouns
What is a Noun
Transportation
How to Fly Like a Bat
Morphing a Wing to Save Fuel
Seen on the Science Fair Scene
Weather
In Antarctica watch the heat (and your step)
Earth's Poles in Peril
The Best Defense Is a Good Snow Fence
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Electric Backpack

Backpacks are convenient. They can hold your books, your lunch, and a change of clothes, leaving your hands free to do other things. Someday, if you don't mind carrying a heavy load, your backpack might also power your MP3 player, keep your cell phone running, and maybe even light your way home. Scientists from the University of Pennsylvania in Philadelphia and the Marine Biological Laboratory in Woods Hole, Mass., have invented a backpack that makes electricity from energy produced while its wearer walks. The backpack's electricity-creating powers depend on springs used to hang a cloth pack from its metal frame. The frame sits against the wearer's back, and the whole pack moves up and down as the person walks. A mechanism with gears collects energy from this motion and transfers it to an electrical generator. Surprisingly, the researchers found, people walk differently when they wear the springy packs. As a result, wearers use less energy than when lugging regular backpacks. Also, the way the new packs ride on wearers' backs makes them more comfortable than standard packs, the inventors say. The backpack could be especially useful for soldiers, scientists, mountaineers, and emergency workers who typically carry heavy backpacks. These people often rely on global positioning system (GPS) receivers, night-vision goggles, and other battery-powered devices to get around and do their work. Because the pack can make its own electricity, users don't need to give up space in their packs to lots of extra batteries. For the rest of us, power-generating backpacks could make it possible to walk, play video games, watch TV, and listen to music, all at the same time. Electricity-generating packs aren't on the market yet, but if you do get one eventually, just make sure to look both ways before crossing the street!—E. Sohn

Electric Backpack
Electric Backpack








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