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Hungry bug seeks hot meal
Where Have All the Bees Gone?
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How to Silence a Cricket
Fishing for Giant Squid
Poor Devils
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Brain cells take a break
Memory by Hypnosis
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The metal detector in your mouth
The Incredible Shrunken Kids
Toxic Dirt + Avian Flu = Science Fair Success
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Electronic Paper Turns a Page
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Dinosaurs Grow Up
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Results of GSAT are in schools this week
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Easy Ways to Conserve Water
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Sea Otters, Kelp, and Killer Whales
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Oldest Writing in the New World
Ancient Art on the Rocks
A Big Discovery about Little People
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Parrotfish
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Electric Ray
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Yummy bugs
Recipe for Health
Symbols from the Stone Age
GSAT English Rules
Whoever vs. Whomever
Subject and Verb Agreement
Who vs. That vs. Which
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Mastering The GSAT Exam
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Prime Time for Cicadas
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Human Body
Flu Patrol
Music in the Brain
Remembering Facts and Feelings
Invertebrates
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Ants
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Cougars
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Pitbulls
Parents
Expert report highlights the importance to parents of reading to children!
Children and Media
What Not to Say to Emerging Readers
Physics
Road Bumps
Echoes of a Stretched Egg
Powering Ball Lightning
Plants
A Giant Flower's New Family
Fastest Plant on Earth
Flower family knows its roots
Reptiles
Boa Constrictors
Caimans
Gila Monsters
Space and Astronomy
A Star's Belt of Dust and Rocks
No Fat Stars
Pluto's New Moons
Technology and Engineering
Bionic Bacteria
Reach for the Sky
Dancing with Robots
The Parts of Speech
What is a Preposition?
Countable and Uncountable Nouns
What is a Verb?
Transportation
Ready, unplug, drive
Middle school science adventures
Charged cars that would charge
Weather
Watering the Air
Earth's Poles in Peril
A Dire Shortage of Water
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Cell Phone Tattlers

Your cell phone holds secrets about you. Besides the names and numbers that you've programmed into it, traces of your DNA linger on the device, according to a new study. DNA is genetic material that appears in every cell. Like your fingerprint, your DNA is unique to you—unless you have an identical twin. Scientists today routinely analyze DNA in blood, saliva, or hair left behind at the scene of a crime. The results often help detectives identify criminals and their victims. Meghan J. McFadden, a molecular biologist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the device. This made her wonder whether traces of DNA lingered on cell phones—even when no blood was involved. To find out, she and a colleague collected flip-style phones from 10 volunteers. They used swabs to collect invisible traces of the users from two parts of the phone: the outside, where the user holds it, and the speaker, which is placed at the user's ear. The scientists scrubbed the phones using a solution made mostly of alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones back for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more. The scientists discovered DNA that belonged to the phone's owner on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also handled the phone. Surprisingly, DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won't remove all traces of evidence from a criminal's device. So cell phones can now be added to the list of clues that can clinch a crime-scene investigation.—Emily Sohn

Cell Phone Tattlers
Cell Phone Tattlers








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