New Gene Fights Potato Blight
Middle school science adventures
Growing Healthier Tomato Plants
Tree Frogs
Salamanders and Newts
A Seabird's Endless Summer
Dolphin Sponge Moms
Big Squid
The Electric Brain
Pollution at the ends of the Earth
Calculating crime
Chemistry and Materials
The chemistry of sleeplessness
Hair Detectives
A New Basketball Gets Slick
Hitting the redo button on evolution
Supersonic Splash
Play for Science
Dinosaurs and Fossils
A Living Fossil
Hall of Dinos
An Ancient Feathered Biplane
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
Island of Hope
Watering the Air
Sky Dust Keeps Falling on Your Head
A Change in Time
Easy Ways to Conserve Water
Fungus Hunt
Finding the Past
Oldest Writing in the New World
Prehistoric Trips to the Dentist
Ancient Art on the Rocks
Flashlight Fishes
Puffer Fish
Food and Nutrition
Packing Fat
Chew for Health
Sponges' secret weapon
GSAT English Rules
Who vs. That vs. Which
Finding Subjects and Verbs
GSAT Exam Preparation Jamaica
2014 GSAT Results for Jamaican Kids
GSAT stars reap scholarship glory
Preparing for the GSAT Exam
GSAT Exams Jamaica Scholarships
GSAT stars reap scholarship glory
GSAT Exam Preparation
2014 GSAT Results for Jamaican Kids
GSAT Mathematics
Secrets of an Ancient Computer
Play for Science
Deep-space dancers
Human Body
A Sour Taste in Your Mouth
Opening a Channel for Tasting Salt
Heart Revival
Raise a Lifelong Reader by Reading Aloud
The Surprising Meaning and Benefits of Nursery Rhymes
Choosing a Preschool: What to Consider
Dreams of Floating in Space
Invisibility Ring
Extra Strings for New Sounds
Sweet, Sticky Science
When Fungi and Algae Marry
Plants Travel Wind Highways
Snapping Turtles
Garter Snakes
Space and Astronomy
Planning for Mars
Galaxies Divide Sharply Along Color Lines
Cousin Earth
Technology and Engineering
Young Scientists Take Flight
Crime Lab
Shape Shifting
The Parts of Speech
What is a Verb?
What is a Noun
What is a Preposition?
Are Propellers Fin-ished?
Robots on a Rocky Road
Where rivers run uphill
Earth's Poles in Peril
Recipe for a Hurricane
In Antarctica watch the heat (and your step)
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Return of the Lost Limbs

When people lose legs after accidents or illnesses, emergency care and artificial limbs often allow them to walk again. But salamanders and newts in the same situation don't need doctors or artificial body parts. They can grow limbs back on their own. Scientists have known for a long time that certain animals can regenerate limbs, but they haven't quite figured out how these creatures do it. Researchers from University College London have now come up with some new insights. Their work may lead to breakthroughs that could eventually enable people, too, to regrow lost limbs. The researchers started with two simple observations: When you cut off a newt's leg at the ankle, only the foot grows back. If you cut off a leg at the base, the whole leg grows back. In both cases, the regrowth begins with stem cells . Stem cells are unspecialized cells that can develop into nearly any type of cell in the body. But how do a newt's stem cells know when to regrow only a foot and when to regrow an entire leg? This question relates to another mystery: In newts, a severed leg will grow back only if the bundle of nerves in it also grows back. But if something prevents the nerve bundle from growing, the stem cells at the site of the wound won't multiply to produce a new leg. In its study, the British team zeroed in on a protein called nAG. When the team prevented nerves in a limb from growing, but added the nAG protein to stem cells in the limb, the limb still regrew. The scientists suspect that nerves in the stub of a limb signal the release of the nAG protein. That protein seems to guide limb regrowth. People and other mammals have proteins that are similar to nAG. Further research into these compounds may some day help human limbs and organs heal themselves.—Emily Sohn

Return of the Lost Limbs
Return of the Lost Limbs

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