Treating peanut allergy bit by bit
Got Milk? How?
Where Have All the Bees Gone?
Tree Frogs
Red Apes in Danger
New Elephant-Shrew
Firefly Delight
The Disappearing Newspaper
When Darwin got sick of feathers
Fighting fat with fat
Chemistry and Materials
The newest superheavy in town
Pencil Thin
Flytrap Machine
The Book of Life
Hitting the redo button on evolution
A Classroom of the Mind
Dinosaurs and Fossils
Meet your mysterious relative
Winged Insects May Go Way Back
Dinosaur Dig
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
Coral Gardens
In Antarctica watch the heat (and your step)
Digging into a Tsunami Disaster
Catching Some Rays
Will Climate Change Depose Monarchs?
Little Bits of Trouble
Finding the Past
Childhood's Long History
If Only Bones Could Speak
Your inner Neandertal
Manta Rays
Nurse Sharks
Food and Nutrition
Allergies: From Bee Stings to Peanuts
The Color of Health
Packing Fat
GSAT English Rules
Who vs. Whom
Adjectives and Adverbs
Subject and Verb Agreement
GSAT Exam Preparation Jamaica
Preparing for the GSAT Exam
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
GSAT Exam Preparation
GSAT Exams Jamaica Scholarships
Access denied - Disabled boy aces GSAT
Results of GSAT are in schools this week
GSAT Scholarship
GSAT Mathematics
A Sweet Advance in Candy Packing
Losing with Heads or Tails
Math Naturals
Human Body
Tapeworms and Drug Delivery
A Better Flu Shot
Germ Zapper
Asian Elephants
Sun Bear
How children learn
Children and Media
Raise a Lifelong Reader by Reading Aloud
Strange Universe: The Stuff of Darkness
Extra Strings for New Sounds
Project Music
Making the most of a meal
The algae invasion
Assembling the Tree of Life
Copperhead Snakes
Garter Snakes
Space and Astronomy
Ready, Set, Supernova
Cousin Earth
An Earthlike Planet
Technology and Engineering
Reach for the Sky
Supersuits for Superheroes
Space Umbrellas to Shield Earth
The Parts of Speech
What is a Noun
Countable and Uncountable Nouns
Adjectives and Adverbs
Middle school science adventures
Reach for the Sky
Are Propellers Fin-ished?
Either Martians or Mars has gas
Warmest Year on Record
A Change in Climate
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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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