Agriculture
Silk’s superpowers
Treating peanut allergy bit by bit
Hungry bug seeks hot meal
Amphibians
Newts
Salamanders and Newts
Poison Dart Frogs
Animals
Assembling the Tree of Life
A Jellyfish's Blurry View
Insects Take a Breather
Behavior
The Other Side of the Zoo Fence
Face values
Honeybees do the wave
Birds
Albatrosses
Peafowl
Emus
Chemistry and Materials
Cooking Up Superhard Diamonds
Atom Hauler
Hair Detectives
Computers
Lighting goes digital
Hitting the redo button on evolution
Two monkeys see a more colorful world
Dinosaurs and Fossils
Mini T. rex
Three strikes wiped out woolly mammoths
Watery Fate for Nature's Gliders
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Earth
Coral Islands Survive a Tsunami
Snowflakes and Avalanches
Digging into a Tsunami Disaster
Environment
The Birds are Falling
Shrimpy Invaders
Snow Traps
Finding the Past
Words of the Distant Past
An Ancient Childhood
Ancient Art on the Rocks
Fish
Basking Sharks
Angler Fish
Catfish
Food and Nutrition
How Super Are Superfruits?
Recipe for Health
Chew for Health
GSAT English Rules
Who vs. That vs. Which
Capitalization Rules
Subject and Verb Agreement
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GSAT Mathematics
How to Slice a Cake Fairly
Math Naturals
Play for Science
Human Body
Teen Brains, Under Construction
Germ Zapper
Hear, Hear
Invertebrates
Tarantula
Moths
Crawfish
Mammals
Donkeys
Cape Buffalo
Giant Panda
Parents
Children and Media
Choosing a Preschool: What to Consider
Raise a Lifelong Reader by Reading Aloud
Physics
Black Hole Journey
Invisibility Ring
Speedy stars
Plants
Farms sprout in cities
White fuzzy mold not as friendly as it looks
Flower family knows its roots
Reptiles
Geckos
Reptiles
Lizards
Space and Astronomy
Solving a Sedna Mystery
The two faces of Mars
A Very Distant Planet Says "Cheese"
Technology and Engineering
Drawing Energy out of Wastewater
Reach for the Sky
Are Propellers Fin-ished?
The Parts of Speech
Pronouns
What is a Noun
Adjectives and Adverbs
Transportation
Robots on a Rocky Road
Troubles with Hubble
Where rivers run uphill
Weather
Warmest Year on Record
Science loses out when ice caps melt
Watering the Air
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Saturn's Spongy Moon

Saturn has a lot going for it. The planet's spectacular rings are pretty cool. It has 31 moons, maybe more. Its largest moon, Titan, even has its own atmosphere. One of its smaller moons, Hyperion, looks like a potato and tumbles strangely as it orbits the planet. Now, the Cassini spacecraft, which is in orbit around Saturn, has taken the first close-up pictures of Hyperion. And the view is surprising. Hyperion is 266 kilometers (165 miles) across, and it has an irregular shape. Much of its inside is probably empty space. Scientists describe the moon as a "rubble pile." On Sept. 26, Cassini swooped to within 500 kilometers (310 miles) of the icy moon. The close-up images showed that Hyperion's surface is unlike that of any of the planet's other moons. They revealed a reddish surface dotted with craters and changed by some unknown process to give it a spongy look. Some Cassini researchers suspect that the spongelike appearance is a result of closely packed craters that were never filled in. Usually, when craters form, debris falls back into the holes. The gravity from nearby Titan, however, may have prevented that from happening.—E. Sohn

Saturn's Spongy Moon
Saturn's Spongy Moon








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