Agriculture
Middle school science adventures
Cleaning Up Fish Farms
Where Have All the Bees Gone?
Amphibians
Tree Frogs
Frogs and Toads
Salamanders
Animals
How to Fly Like a Bat
Fishy Sounds
A Grim Future for Some Killer Whales
Behavior
Mice sense each other's fear
Sugar-pill medicine
World’s largest lizard is venomous too
Birds
Cassowaries
Quails
Seagulls
Chemistry and Materials
Lighting goes digital
Fog Buster
Supergoo to the rescue
Computers
Programming with Alice
New eyes to scan the skies
Two monkeys see a more colorful world
Dinosaurs and Fossils
A Dino King's Ancestor
Dino Babies
Dinosaurs Grow Up
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Earth
Ancient Heights
Farms sprout in cities
Getting the dirt on carbon
Environment
Giant snakes invading North America
Missing Tigers in India
Power of the Wind
Finding the Past
Fakes in the museum
Childhood's Long History
Stone Age Sole Survivors
Fish
Puffer Fish
Lampreys
Tuna
Food and Nutrition
The Color of Health
Yummy bugs
Turning to Sweets, Fats to Calm the Brain
GSAT English Rules
Who vs. Whom
Finding Subjects and Verbs
Subject and Verb Agreement
GSAT Exam Preparation Jamaica
10 Common Mistakes When Preparing for the GSAT Math Test
Ministry of Education Announces 82 GSAT Scholarships for 2010
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Monkeys Count
Human Body
Dreaming makes perfect
From Stem Cell to Any Cell
Sleeping Soundly for a Longer Life
Invertebrates
Termites
Ticks
Dragonflies
Mammals
Kodiak Bear
Dachshunds
Siberian Husky
Parents
Raise a Lifelong Reader by Reading Aloud
The Surprising Meaning and Benefits of Nursery Rhymes
How children learn
Physics
Electric Backpack
The Mirror Universe of Antimatter
Thinner Air, Less Splatter
Plants
A Change in Leaf Color
Plants Travel Wind Highways
Flower family knows its roots
Reptiles
Caimans
Boa Constrictors
Snakes
Space and Astronomy
Sounds of Titan
Planet Hunters Nab Three More
Rover Makes Splash on Mars
Technology and Engineering
Drawing Energy out of Wastewater
Beyond Bar Codes
Shape Shifting
The Parts of Speech
What is a Noun
What is a Preposition?
Adjectives and Adverbs
Transportation
Charged cars that would charge
Flying the Hyper Skies
Are Propellers Fin-ished?
Weather
The Best Defense Is a Good Snow Fence
Weekend Weather Really Is Different
In Antarctica watch the heat (and your step)
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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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