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Chicken Eggs as Drug Factories
Fast-flying fungal spores
Protecting Cows—and People—from a Deadly Disease
Amphibians
Toads
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Newts
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Insects Take a Breather
Monkeys Count
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Roadrunners
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Meteorites may have sparked life on Earth
Getting the dirt on carbon
Revving Up Green Machines
Computers
The Shape of the Internet
It's a Small E-mail World After All
Games with a Purpose
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An Ancient Spider's Web
Downsized Dinosaurs
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Earth
Shrinking Glaciers
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Hints of Life in Ancient Lava
Environment
A Change in Climate
Little Bits of Trouble
The Wolf and the Cow
Finding the Past
Fakes in the museum
Settling the Americas
Little People Cause Big Surprise
Fish
Salmon
Great White Shark
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Chew for Health
How Super Are Superfruits?
A Pepper Part that Burns Fat
GSAT English Rules
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Deep-space dancers
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Human Body
What the appendix is good for
Dreaming makes perfect
Football Scrapes and Nasty Infections
Invertebrates
Tarantula
Sea Anemones
Jellyfish
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Dalmatians
Parents
Raise a Lifelong Reader by Reading Aloud
Choosing a Preschool: What to Consider
How children learn
Physics
Echoes of a Stretched Egg
Einstein's Skateboard
Black Hole Journey
Plants
Hungry bug seeks hot meal
A Change in Leaf Color
Making the most of a meal
Reptiles
Anacondas
Geckos
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Space and Astronomy
Sounds of Titan
Planning for Mars
A Great Ball of Fire
Technology and Engineering
Riding Sunlight
Young Scientists Take Flight
Crime Lab
The Parts of Speech
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Problems with Prepositions
Transportation
Tinkering With the Basic Bike
Middle school science adventures
Are Propellers Fin-ished?
Weather
Arctic Melt
Warmest Year on Record
Watering the Air
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Heart Revival

When your heart works like it's supposed to, it keeps you alive and well. But when the heart fails, people can get very sick or even die. Now, scientists have found a way to turn dead rat hearts into living ones. It's a medical first, and the technique may eventually allow doctors to make new hearts from patients' own cells. This should largely avoid the risk that the patient's body will reject the new heart, which often happens today. Researchers from the University of Minnesota in Minneapolis started with hearts from rats that had been dead for less than 18 hours. Led by Doris A. Taylor, the scientists put the hearts in glass beakers and used a liquid detergent to wash away the dead cells. Left behind was a heart-shaped mass of proteins that normally surround heart cells and hold them together. The mass was translucent, which means it lets light through, and it had the consistency of Jell-O. Next, Taylor and her colleagues took cells from hearts of newborn rats. They injected these living cells into the hollowed-out hearts. Eight days later, the hearts were pumping weakly. And the injected cells in each heart beat synchronously—that is, all at the same time. "The fact that we can get these cells to beat synchronously is incredibly encouraging," Taylor says. It will be years before doctors might consider using this method to repair hearts in people, the scientists warn. In the study, the rebuilt hearts could pump blood only about 2 percent as fast as a normal adult rat heart can. Eventually, scientists would like to be able to use primitive stem cells from a patient's blood or heart tissue to repair his or her own organs.—Emily Sohn

Heart Revival
Heart Revival








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