Agriculture
Seeds of the Future
New Gene Fights Potato Blight
Flush-Free Fertilizer
Amphibians
Toads
Tree Frogs
Poison Dart Frogs
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A Butterfly's New Green Glow
Lucky Survival for Black Cats
Eyes on the Depths
Behavior
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
Pain Expectations
Face values
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Sweeeet! The Skinny on Sugar Substitutes
Moon Crash, Splash
Pencil Thin
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Secrets of an Ancient Computer
The hungry blob at the edge of the universe
The solar system's biggest junkyard
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Early Birds Ready to Rumble
Downsized Dinosaurs
A Living Fossil
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
Earth
In Antarctica watch the heat (and your step)
Ancient Heights
Hot Summers, Wild Fires
Environment
The Birds are Falling
City Trees Beat Country Trees
Shrimpy Invaders
Finding the Past
Prehistoric Trips to the Dentist
Little People Cause Big Surprise
Unearthing Ancient Astronomy
Fish
A Grim Future for Some Killer Whales
Lampreys
Whale Sharks
Food and Nutrition
Food for Life
Allergies: From Bee Stings to Peanuts
A Taste for Cheese
GSAT English Rules
Pronouns
Order of Adjectives
Finding Subjects and Verbs
GSAT Exam Preparation Jamaica
The Annual GSAT Scholarships
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
GSAT Exams Jamaica Scholarships
GSAT Scholarship
GSAT Exam Preparation
GSAT stars reap scholarship glory
GSAT Mathematics
Math is a real brain bender
How a Venus Flytrap Snaps Shut
How to Slice a Cake Fairly
Human Body
From Stem Cell to Any Cell
Attacking Asthma
Smiles Turn Away Colds
Invertebrates
Praying Mantis
Earthworms
Sponges
Mammals
African Mammals
Miscellaneous Mammals
Blue Whales
Parents
The Surprising Meaning and Benefits of Nursery Rhymes
Choosing a Preschool: What to Consider
Raise a Lifelong Reader by Reading Aloud
Physics
Echoes of a Stretched Egg
The Mirror Universe of Antimatter
Invisibility Ring
Plants
Getting the dirt on carbon
Springing forward
Assembling the Tree of Life
Reptiles
Garter Snakes
Boa Constrictors
Caimans
Space and Astronomy
Asteroid Moons
An Earthlike Planet
Evidence of a Wet Mars
Technology and Engineering
Space Umbrellas to Shield Earth
Weaving with Light
Roll-Up Computer Monitors to Go
The Parts of Speech
Problems with Prepositions
Pronouns
What is a Noun
Transportation
Seen on the Science Fair Scene
Ready, unplug, drive
Tinkering With the Basic Bike
Weather
Science loses out when ice caps melt
Where rivers run uphill
A Dire Shortage of Water
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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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