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Toxic Dirt + Avian Flu = Science Fair Success
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Results of GSAT are in schools this week
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Preserving Ancient Warrior Paint
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A Better Flu Shot
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Teen Brains, Under Construction
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Raise a Lifelong Reader by Reading Aloud
Choosing a Preschool: What to Consider
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The Mirror Universe of Antimatter
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Invisibility Ring
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Farms sprout in cities
Hungry bug seeks hot meal
White fuzzy mold not as friendly as it looks
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Black Mamba
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Killers from Outer Space
A Galaxy Far, Far, Far Away
Tossing Out a Black Hole Life Preserver
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Model Plane Flies the Atlantic
Morphing a Wing to Save Fuel
Slip Sliming Away
The Parts of Speech
Adjectives and Adverbs
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Countable and Uncountable Nouns
Transportation
Revving Up Green Machines
Charged cars that would charge
Morphing a Wing to Save Fuel
Weather
Arctic Melt
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Echoes of a Stretched Egg

You are what you eat, a familiar saying goes. When it comes to eggs, though, you don't even have to eat them to resemble one. Sound waves bounce off people as if each person were an enormous, stretched-out chicken egg, scientists reported recently at a meeting of the Acoustical Society of America. The discovery could help designers build better concert halls or other buildings where sound is important. The shape of an object determines which way sound bounces off of it. Two years ago, a pair of researchers from France discovered that they could use sound to determine the shape of an object as it moves around in a tank of water. This finding suggested the possibility of using sound as a way to identify and count different species of fish in the ocean automatically. Fish can be hard to handle, however, so the researchers chose to work first with people. In one experiment, people walked around inside a hard-walled room, while the scientists used microphones to record echoes of sounds produced by speakers. Participants ranged in age from 3 to 55 years. Analyses of the results showed that each person reflected sound in the same way as would an egg of his or her size. From the viewpoint of sound waves, most of us would have shapes that are somewhat taller and thinner than an average egg. Now, would you like your sounds scrambled, boiled, or fried?E. Sohn

Echoes of a Stretched Egg
Echoes of a Stretched Egg








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