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Seeds of the Future
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Helping the Cause of Macaws
A Tongue and a Half
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A Recipe for Happiness
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A Framework for Growing Bone
Graphene's superstrength
The hungry blob at the edge of the universe
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Secrets of an Ancient Computer
A New Look at Saturn's rings
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Tiny Pterodactyl
Big Fish in Ancient Waters
Ferocious Growth Spurts
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Earth
Ancient Heights
In Antarctica watch the heat (and your step)
Wave of Destruction
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Toxic Cleanups Get a Microbe Boost
Saving Wetlands
Giant snakes invading North America
Finding the Past
A Long Haul
Prehistoric Trips to the Dentist
Watching deep-space fireworks
Fish
Hagfish
Great White Shark
Flashlight Fishes
Food and Nutrition
Making good, brown fat
Chocolate Rules
Turning to Sweets, Fats to Calm the Brain
GSAT English Rules
Who vs. That vs. Which
Who vs. Whom
Subject and Verb Agreement
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GSAT stars reap scholarship glory
GSAT Scholarship
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GSAT Scholarship
Access denied - Disabled boy aces GSAT
GSAT Mathematics
Math of the World
How a Venus Flytrap Snaps Shut
Setting a Prime Number Record
Human Body
Football Scrapes and Nasty Infections
Taste Messenger
A Better Flu Shot
Invertebrates
Walking Sticks
Dragonflies
Crustaceans
Mammals
Giant Panda
Manxes
Cats
Parents
What Not to Say to Emerging Readers
Raise a Lifelong Reader by Reading Aloud
Choosing a Preschool: What to Consider
Physics
Hold on to your stars, ladies and gentlemen
Echoes of a Stretched Egg
Speedy stars
Plants
Making the most of a meal
City Trees Beat Country Trees
Farms sprout in cities
Reptiles
Box Turtles
Anacondas
Cobras
Space and Astronomy
A Planet from the Early Universe
Supernovas Shed Light on Dark Energy
Baby Star
Technology and Engineering
Slip Sliming Away
Space Umbrellas to Shield Earth
Reach for the Sky
The Parts of Speech
Adjectives and Adverbs
Countable and Uncountable Nouns
What is a Verb?
Transportation
Middle school science adventures
Where rivers run uphill
Tinkering With the Basic Bike
Weather
Polar Ice Feels the Heat
Science loses out when ice caps melt
Weekend Weather Really Is Different
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Slumber by the numbers

It’s an important question: “On an average school night, how many hours of sleep do you get?” More than 12,000 high school students were recently asked that during a survey by the Centers for Disease Control and Prevention. The overall answer: not enough. Studies have shown that teenagers really need at least nine hours of sleep, with eight hours considered a “borderline” acceptable amount. In the CDC study, however, only around 900 of the surveyed students reported getting the ideal amount, while an additional 2,800 reported averaging eight hours of shut-eye nightly. Danice Eaton, a research scientist at the CDC, led this most recent survey, which was part of what the agency calls a Youth Risk Behavior Surveillance. Every year, CDC scientists like Eaton ask high school students about behaviors that can harm their health. The questions are on topics such as nutrition, weapons, sex and drug use — and sleep. Sleeplessness, like other behaviors, carries a heavy toll. Scientists ask the survey questions to find a way to help people. Among people between the ages of 10 and 24, nearly three of every four deaths happen for one of the following reasons: motor vehicle accident, other accidents, homicide and suicide. Scientists like the CDC’s Eaton hope that by understanding the risky behaviors, like sleeplessness, that might contribute to these tragedies, they may be able to save lives. Also, without enough sleep, a person might have more trouble learning or exercising good judgment. Over time, people who regularly don’t get enough sleep are more likely to be obese (which means very overweight) or get sick with serious diseases, some studies have found. Other studies have shown that even one night with less sleep than needed can throw off the chemical balance of the body. Most students interviewed got much less than eight hours of sleep. Eaton and her team found that 30.2 percent, or about 3,600 students, sleep for only seven hours per night. About 2,700 students, or 22.8 percent, sleep only six hours per night. About 1,200 students, or 10 percent, reported sleeping five hours, and 5.9 percent, or 708 students, said they slept four hours or less. The CDC’s study identified a problem — but not the cause. Why do teenagers sleep less than they should? Maybe many teens like to work and stay up late. (This can make it rough to get up for school the next morning.) A number of scientific studies suggest some other ideas, as well. Computer use may be a culprit: Some scientists have found that the blue light given off by computer screens may interfere with the body’s internal biological clock — making it difficult to go to sleep. Other scientists have come up with new and interesting ways to help people who can’t sleep. Studies suggest, for example, that a person’s biological clock responds favorably to blue light that is the color of the sky. So perhaps people are biologically “set” to start their day when they see the sky — and when people see a blue computer screen, their bodies misinterpret the light as morning. Some research has shown that donning a pair of yellow glasses at night will block the blue wavelengths. This allows people to become naturally sleepy, even after a long night on the computer. Whatever the cause of too little sleep may turn out to be, the CDC’s effort to identify the problem is an early step toward finding a treatment. Once scientists understand the problem, they can design ways to solve it.

Slumber by the numbers
Slumber by the numbers








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