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Making the most of a meal
Frogs and Toads
A Tongue and a Half
How to Fly Like a Bat
Color-Changing Bugs
The Smell of Trust
A Recipe for Happiness
The case of the headless ant
Blue Jays
Chemistry and Materials
The hottest soup in New York
A Framework for Growing Bone
These gems make their own way
Galaxies far, far, far away
Hubble trouble doubled
Electronic Paper Turns a Page
Dinosaurs and Fossils
Digging Dinos
Supersight for a Dino King
Ferocious Growth Spurts
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Earth's Lowly Rumble
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Unnatural Disasters
Food Web Woes
Hazy with a Chance of Sunshine
Out in the Cold
Finding the Past
Childhood's Long History
A Human Migration Fueled by Dung?
Watching deep-space fireworks
Megamouth Sharks
Food and Nutrition
Packing Fat
Building a Food Pyramid
The Essence of Celery
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Order of Adjectives
Whoever vs. Whomever
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Mastering The GSAT Exam
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Human Body
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Hear, Hear
Giant Clam
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Children and Media
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Invisibility Ring
Electric Backpack
Cactus Goo for Clean Water
The algae invasion
Getting the dirt on carbon
Space and Astronomy
Witnessing a Rare Venus Eclipse
Sun Flips Out to Flip-Flop
Unveiling Titan
Technology and Engineering
Switchable Lenses Improve Vision
Drawing Energy out of Wastewater
A Clean Getaway
The Parts of Speech
Adjectives and Adverbs
Countable and Uncountable Nouns
What is a Noun
Robots on a Rocky Road
Morphing a Wing to Save Fuel
Are Propellers Fin-ished?
Polar Ice Feels the Heat
Recipe for a Hurricane
Earth's Poles in Peril
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From Chimps to People

It can be fascinating to watch chimpanzees at the zoo. Chimps are the closest, living animal relatives to people. Watching them can be like watching ourselves. To figure out just how similar people and chimps are, scientists have been studying DNA—material in every cell that makes up genes and determines much of what we look like and who we are. Recently, an international group of researchers compared the entire genome (or set of DNA) of a male chimp to DNA data from people. The results show that people and chimpanzees are indeed very similar, but we might be more different genetically than scientists previously thought. DNA is made up of units called nucleotides. The sequence of nucleotides, also called base pairs, determines what genes do. The new study found that 3 billion of these base pairs have the same pattern in people and chimps 96 percent of the time. That might sound like we have a lot in common. There are, however, as many as 3 million important base pairs that are different. The scientists found six segments of DNA that seem to have changed a lot in people over the last 250,000 years. There was also a lot of variety at the ends of long stretches of DNA called chromosomes. Other results show that chimpanzees have major mutations (nucleotide changes) on their Y chromosomes (which only males have), but human males don't have the same mutations. And genes that are active in the brain have more mutations in people than in chimps. Scientists don't yet know what all of these differences mean. The more they learn, the more we'll understand about the ancestors that we share with our ape cousins. Now, that's something to think about the next time you eat a banana!—E. Sohn

From Chimps to People
From Chimps to People

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