A Workout Can Change Your DNA

Reporting in Cell Metabolism, researchers write that when people who lead relatively sedentary lives worked out the DNA in their muscle fibers changed almost immediately. Scientists also found caffeine had the same effect on isolated rodent muscles. Study co-author Juleen Zierath discusses the DNA modifications.

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Dark Matter Just Got More Mysterious

Reporting in the Astrophysical Journal, scientists write of a massive collision between two galaxy clusters. By studying the cosmic remnants of that smashup, they say leftover dark matter isn’t behaving as current theory predicts. Astrophysicist Andisheh Mahdavi discusses this dark matter mystery.

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Antarctica Visitors Unwittingly Bring Invasive Species

The far reaches of Antarctica are no longer visited only by scientists and their support staff. Adventure tourists and curiosity seekers from Europe, North America and beyond now come by the boatful — and they’re bringing some souvenirs from home. Ecologist Steven Chown tells Robert Siegel that visitors unknowingly carry seeds on their clothes and bags. He says they’ve helped spread dozens of invasive plant species on the continent and risk permanently changing Antarctica’s ecology.

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Neil deGrasse Tyson On Exploring Cosmic Frontiers

In Space Chronicles: Facing the Ultimate Frontier, astrophysicist Neil deGrasse Tyson writes of how space exploration–especially human voyages–can profoundly inspire scientists and technologists of the future, and charts the path for missions to Mars and beyond.

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New Methods Could Speed Up Repair Of Injured Nerves

Scientists say they’ve developed a technique that reconnects the severed ends of a nerve, allowing it to begin carrying messages again very quickly — at least in rats. Usually, severed nerves must regrow from the point of injury — a process that can take months, if it ever happens.

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New Methods Could Speed Up Repair Of Injured Nerves

Scientists say they’ve developed a technique that reconnects the severed ends of a nerve, allowing it to begin carrying messages again very quickly — at least in rats. Usually, severed nerves must regrow from the point of injury — a process that can take months, if it ever happens.

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Reaching For The Limits of Tiny Transistors

Computer chip makers have long struggled to build ever-smaller transistors to allow faster, more powerful computers. Writing in the journal Nature Nanotechnology, a team of scientists describes what may be the ultimate limit of that struggle — a transistor made of a single atom. Michelle Simmons, a physicist at the University of New South Wales in Australia and leader of the project, discusses the work.

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Disease Sleuths Surf For Outbreaks Online

When sick people search the Web for remedies or tweet about their symptoms, they’re sending an early warning signal about disease outbreaks. Now scientists and public health officials are listening in.

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Disease Sleuths Surf For Outbreaks Online

When sick people search the Web for remedies or tweet about their symptoms, they’re sending an early warning signal about disease outbreaks. Now scientists and public health officials are listening in.

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