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Thieves of a Feather
A Seabird's Endless Summer
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Swedish Rhapsody
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Flytrap Machine
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Smelly Traps for Lampreys
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Snowflakes and Avalanches
A Grim Future for Some Killer Whales
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A Stormy History
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Sea Otters, Kelp, and Killer Whales
Finding the Past
Prehistoric Trips to the Dentist
A Long Haul
Chicken of the Sea
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Manta Rays
Perches
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Chew for Health
Turning to Sweets, Fats to Calm the Brain
Building a Food Pyramid
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How are students placed after passing the GSAT exam
Ministry of Education Announces 82 GSAT Scholarships for 2010
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Prime Time for Cicadas
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
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Human Body
Surviving Olympic Heat
Tapeworms and Drug Delivery
A Fix for Injured Knees
Invertebrates
Krill
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Hermit Crabs
Mammals
Pitbulls
Coyotes
African Warthogs
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What Not to Say to Emerging Readers
The Surprising Meaning and Benefits of Nursery Rhymes
Physics
One ring around them all
Project Music
Strange Universe: The Stuff of Darkness
Plants
A Giant Flower's New Family
Stalking Plants by Scent
Springing forward
Reptiles
Anacondas
Copperhead Snakes
Boa Constrictors
Space and Astronomy
Planet Hunters Nab Three More
A Very Distant Planet Says "Cheese"
A Puffy Planetary Puzzle
Technology and Engineering
Algae Motors
Machine Copy
Shape Shifting
The Parts of Speech
What is a Verb?
Countable and Uncountable Nouns
Problems with Prepositions
Transportation
Seen on the Science Fair Scene
Revving Up Green Machines
Morphing a Wing to Save Fuel
Weather
Either Martians or Mars has gas
Where rivers run uphill
A Change in Climate
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Don't Eat That Sandwich!

Oops! In the rush to get to school, you drop a piece of toast on the floor. Do you throw it away or decide it's still OK to eat? If you're like most people, you eat it. Maybe you follow the "5-second rule," which claims foods are safe to eat if you pick them up within 5 seconds of dropping them. But you might want to think again. Scientists now say that 5 seconds are all it takes for foods to become contaminated with enough bacteria to make you sick. Bacteria are single-celled organisms that can cause many kinds of illnesses. Some kinds of bacteria can grow on food. If we eat foods on which these bacteria are growing, we can become sick. Common symptoms include vomiting and diarrhea. One of these food-borne bacteria is Salmonella. It makes 1.4 million people sick every year. Earlier this year, 370 people became sick after eating peanut butter that had been contaminated with Salmonella at the manufacturing plant. Salmonella are often found in raw eggs and chicken. Cooking kills these bacteria, which is why it is so important to cook eggs, chicken, and other foods thoroughly. Being a good housekeeper is a second tip for preventing infection. If household surfaces aren't washed thoroughly, they can support Salmonella for weeks. But how long does it take these bacteria to attach to food? To answer that question, a team of scientists at Clemson University in South Carolina decided to test the 5-second rule, using sandwich ingredients. First, they placed a known amount of Salmonella cells on three surfaces: wood, tile, and carpet. They placed a slice of bread and a slice of bologna on each surface for 5, 30, or 60 seconds. After just 5 seconds, both the bread and bologna picked up enough bacteria to make you sick. "Someone making a sandwich might follow someone who, a day before, used that surface to cut meat or another raw food. It might not look contaminated, but could have bacteria that would be harmful," said Paul Dawson, the food scientist who led the study. So, forget the 5-second rule. If your toast lands on the floor, toss it out. Stick a fresh slice of bread in the toaster. And this time, be careful not to drop it!—Jennifer Cutraro

Don't Eat That Sandwich!
Don't Eat That Sandwich!








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