Watching out for vultures
Microbes at the Gas Pump
Seeds of the Future
Frogs and Toads
Monkeys Count
Life on the Down Low
Fishy Sounds
Talking with Hands
Newly named fish crawls and hops
Honeybees do the wave
Chemistry and Materials
Hair Detectives
Sticky Silky Feet
Flytrap Machine
A Light Delay
The solar system's biggest junkyard
The Book of Life
Dinosaurs and Fossils
The Paleontologist and the Three Dinosaurs
Dino Babies
Message in a dinosaur's teeth
E Learning Jamaica
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Rodent Rubbish as an Ice-Age Thermometer
Sky Dust Keeps Falling on Your Head
Ice Age Melting and Rising Seas
Snow Traps
Groundwater and the Water Cycle
To Catch a Dragonfly
Finding the Past
Watching deep-space fireworks
Oldest Writing in the New World
Stone Age Sole Survivors
A Jellyfish's Blurry View
Food and Nutrition
Chew for Health
The Color of Health
Yummy bugs
GSAT English Rules
Who vs. Whom
Whoever vs. Whomever
Who vs. That vs. Which
GSAT Exam Preparation Jamaica
The Annual GSAT Scholarships
10 Common Mistakes When Preparing for the GSAT Math Test
2014 GSAT Results for Jamaican Kids
GSAT Exams Jamaica Scholarships
Results of GSAT are in schools this week
GSAT Scholarship
GSAT Exam Preparation
GSAT Mathematics
Math of the World
Losing with Heads or Tails
Setting a Prime Number Record
Human Body
Spit Power
Foul Play?
The tell-tale bacteria
Vampire Bats
Children and Media
The Surprising Meaning and Benefits of Nursery Rhymes
Choosing a Preschool: What to Consider
Road Bumps
One ring around them all
Invisibility Ring
Underwater Jungles
Bright Blooms That Glow
Cactus Goo for Clean Water
Space and Astronomy
Saturn's New Moons
A Planet from the Early Universe
Chaos Among the Planets
Technology and Engineering
Are Propellers Fin-ished?
Space Umbrellas to Shield Earth
A Micro-Dose of Your Own Medicine
The Parts of Speech
Problems with Prepositions
What is a Preposition?
Flying the Hyper Skies
Revving Up Green Machines
Middle school science adventures
A Change in Climate
The Best Defense Is a Good Snow Fence
Arctic Melt
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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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