Treating peanut allergy bit by bit
Chicken Eggs as Drug Factories
Fast-flying fungal spores
Salamanders and Newts
Koalas, Up Close and Personal
A Jellyfish's Blurry View
Red Apes in Danger
Nice Chimps
Swine flu goes global
Mice sense each other's fear
Blue Jays
Chemistry and Materials
Moon Crash, Splash
Undercover Detectives
Sugary Survival Skill
Music of the Future
Supersonic Splash
Two monkeys see a more colorful world
Dinosaurs and Fossils
Big Fish in Ancient Waters
Hall of Dinos
Hunting by Sucking, Long Ago
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Deep History
Rodent Rubbish as an Ice-Age Thermometer
A Grim Future for Some Killer Whales
Shrinking Fish
Blooming Jellies
The Birds are Falling
Finding the Past
Settling the Americas
Watching deep-space fireworks
Digging Up Stone Age Art
Pygmy Sharks
Angler Fish
Food and Nutrition
Symbols from the Stone Age
Moving Good Fats from Fish to Mice
Allergies: From Bee Stings to Peanuts
GSAT English Rules
Whoever vs. Whomever
Subject and Verb Agreement
Who vs. That vs. Which
GSAT Exam Preparation Jamaica
Preparing for the GSAT Exam
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GSAT stars reap scholarship glory
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GSAT Practice Papers | GSAT Mathematics | Maths
Access denied - Disabled boy aces GSAT
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Prime Time for Cicadas
Math and our number sense:
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Human Body
A Better Flu Shot
Dreaming makes perfect
From Stem Cell to Any Cell
Children and Media
How children learn
What Not to Say to Emerging Readers
One ring around them all
Einstein's Skateboard
Echoes of a Stretched Egg
Making the most of a meal
Hungry bug seeks hot meal
Assembling the Tree of Life
Boa Constrictors
Black Mamba
Space and Astronomy
A Whole Lot of Nothing
Gravity Tractor as Asteroid Mover
Sounds of Titan
Technology and Engineering
Weaving with Light
Toy Challenge
Riding Sunlight
The Parts of Speech
What is a Noun
Adjectives and Adverbs
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Middle school science adventures
Morphing a Wing to Save Fuel
Flying the Hyper Skies
Earth's Poles in Peril
A Change in Climate
Where rivers run uphill
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Killer Space Rock Snuffed Out Ancient Life

Long before dinosaurs ever lived, Earth suffered a major catastrophe that wiped out most life on the planet. About 250 million years ago, 95 percent of species in the oceans died out, along with 70 percent of species on land. New research may help explain what happened. Scientists are already pretty sure that a huge meteor wiped out dinosaurs 65 million years ago. There's some evidence from China, Japan, and other places suggesting that a similar impact may have occurred 250 million years ago. The newest evidence comes from Antarctica. Researchers at the University of Rochester in New York used magnets and other equipment to extract pieces of metal and minerals from Antarctic dirt that is 250 million years old. Analyses showed that particles in the dirt must have come from outer space. Amounts of iron, nickel, and other materials exactly match the composition of a type of meteorite that formed about 4.5 billion years ago. That's around the time that our solar system was born. The discovery doesn't necessarily prove that a meteor caused mass extinctions 250 million years ago. It only shows that they happened at around the same time. Still, it now seems clear that big meteors can spell big trouble for life on earth. Luckily for us, such collisions are extremely rare!E. Sohn

Killer Space Rock Snuffed Out Ancient Life
Killer Space Rock Snuffed Out Ancient Life

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