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Ministry of Education Announces 82 GSAT Scholarships for 2010
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GSAT Exams Jamaica Scholarships
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Monkeys Count
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A Sweet Advance in Candy Packing
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Prime Time for Broken Bones
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The Surprising Meaning and Benefits of Nursery Rhymes
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Spin, Splat, and Scramble
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Farms sprout in cities
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Melting Snow on Mars
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Intruder Alert: Sweeping Space for Dust
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Morphing a Wing to Save Fuel
Sugar Power for Cell Phones
Model Plane Flies the Atlantic
The Parts of Speech
What is a Preposition?
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Morphing a Wing to Save Fuel
Where rivers run uphill
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Weekend Weather Really Is Different
Science loses out when ice caps melt
Polar Ice Feels the Heat
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Machine Copy

It would be a perfect theme for a horror movie: People build robots that can make copies of themselves. Robots reproduce like crazy. Robots take over the world. Ridiculous? In fact, only part of the story is fiction. Robots haven't yet taken over the world, but scientists from Cornell University have created simple machines that can make more of their own kind. The process is called self-replication. Far from being nightmarish, the researchers say, self-replicating robots could revolutionize space exploration. And they'd be perfect for clearing minefields and doing other risky tasks. Best of all, they'd be able to repair themselves. The new robots are made of stacks of blocks called "molecubes." Each cube is about the size of an adult's fist. Inside, there's a motor, electromagnets, and a tiny computer processor. The cubes are divided diagonally into plastic halves that can swivel back and forth. As a robot copies itself, computer programs tell the cube halves how to rotate. Electromagnets, meanwhile, let go of some cubes and pick up others that have been placed nearby. During the process, the stack of cubes twists and bends into various shapes, such as L's or upside-down U's. In the end, there are two identical objects, where once there was just one. This may not sound very impressive—yet. But it's a step on the path toward complex machines that can make copies of themselves.—E. Sohn

Machine Copy
Machine Copy








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