Fast-flying fungal spores
Springing forward
Making the most of a meal
Frogs and Toads
Eyes on the Depths
Little Bee Brains That Could
A Sense of Danger
A Light Delay
Baby Talk
When Darwin got sick of feathers
Chemistry and Materials
The metal detector in your mouth
The hungry blob at the edge of the universe
The memory of a material
Computers with Attitude
The solar system's biggest junkyard
Small but WISE
Dinosaurs and Fossils
Dinosaur Dig
Dinosaur Eggs-citement
Feathered Fossils
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Giving Sharks Safe Homes
Explorer of the Extreme Deep
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City Trees Beat Country Trees
Groundwater and the Water Cycle
Whale Watch
Finding the Past
Digging Up Stone Age Art
Words of the Distant Past
The Taming of the Cat
A Grim Future for Some Killer Whales
Cleaning Up Fish Farms
Food and Nutrition
Recipe for Health
How Super Are Superfruits?
Building a Food Pyramid
GSAT English Rules
Who vs. That vs. Which
Subject and Verb Agreement
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GSAT Exam Preparation Jamaica
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How a Venus Flytrap Snaps Shut
Human Body
Walking to Exercise the Brain
A Sour Taste in Your Mouth
Tapeworms and Drug Delivery
African Leopards
Guinea Pigs
What Not to Say to Emerging Readers
The Surprising Meaning and Benefits of Nursery Rhymes
Children and Media
The Pressure of Scuba Diving
One ring around them all
Project Music
Hungry bug seeks hot meal
Underwater Jungles
Getting the dirt on carbon
Space and Astronomy
Return to Space
A Darker, Warmer Red Planet
Black Holes That Burp
Technology and Engineering
Machine Copy
Spinach Power for Solar Cells
Sugar Power for Cell Phones
The Parts of Speech
What is a Noun
Countable and Uncountable Nouns
Problems with Prepositions
Ready, unplug, drive
Revving Up Green Machines
Troubles with Hubble
A Dire Shortage of Water
Warmest Year on Record
The solar system's biggest junkyard
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Slower Growth, Greater Warmth

There seems little doubt that Earth is heating up. As temperatures rise, many people worry about how global warming may affect life on the planet. A long-term study in Central America gives one more reason for concern. Adult trees in a rain forest in Costa Rica grew more slowly in warm years than they did in cold ones. Such a shift toward slower-growing trees might make the climate warm up even faster. From 1984 to 2000, biologist Deborah A. Clark of the University of Missouri-St. Louis and colleagues measured the width of old trees in a 2-square-kilometer plot of rain forest at La Selva, Costa Rica. During the coolest years, a time period running from 1984 to 1986, the trees grew 81 percent faster than they did during a heat wave that struck in 1997. The trees also grew slowly in 1987, another warm year. In addition, scientists found that, during warm years, Earth's atmosphere contained less carbon dioxide produced by tropical land plants. Carbon dioxide is a heat-trapping gas, which plants normally use up to make food. The new results reinforce how important trees are to the health of the planet and how devastating a continued rise in temperatures might be to their future—and ours.—E. Sohn

Slower Growth, Greater Warmth
Slower Growth, Greater Warmth

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