How do noise cancelling headphones work?

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Does music make you smarter? The founder of an organization that provides free music lessons to low-income students from gang-ridden neighborhoods has noticed a hopeful sign. The kids were graduating high school and heading off to some big universities. That's when Margaret Martin asked how the children... - Posted on September 5, 2014
Which is worse: a light-colored suit or mom jeans? Tongues are wagging over President Barack Obama's audacity to wear a tan suit. The sight of Obama discussing possible U.S. military action in Syria in a light-colored suit lit up Twitter on Thursday, and the reviews of his unusual fashion choice were less than fashionable.... - Posted on September 3, 2014
This little dog’s got the moves! Jiff was already cute, lovable and talented. Now he's proven he's speedy, too. The 4-year-old, 5-pound Pomeranian blazed into the 60th edition of the Guinness World Records book. It comes out Sept. 10. He can run 10 meters (9.1 yards) on his hind legs in 6.56 seconds ... - Posted on September 1, 2014
Un-bee-lievable! 50,000 bees invade apartment A New York City woman had some unexpected roommates living in her apartment: 50,000 bees. WABC-TV reports beekeepers removed the swarm from Frieda Turkmenilli's ceiling this week after her neighbors in Queens alerted the building manager. Turkmenilli says she saw only... - Posted on August 26, 2014
Obama balks at bucket, but Bush accepts challenge Former President George W. Bush took the ice bucket challenge. Then he nominated former President Bill Clinton to do it next. The challenge has caught on with notable figures participating in the campaign to raise money for the fight against ALS, or Lou Gehrig's disease.... - Posted on August 23, 2014
Oh, boy! Girls rock Little League World Series What's everyone talking about at the Little League World Series? Girls, as in girls who are playing on teams typically dominated by boys. Philadelphia's Mo'ne Davis and Canada's Emma March became the 17th and 18th girls to play in the tournament, only the third time in the ... - Posted on August 19, 2014
Hate taking the bus to school? Try swimming! It's a long, wet journey to school for 61 teenagers in part of western India. If they want to learn, they have no choice but to swim. The boys and girls carry books, papers and changes of clothing in plastic bags or buoyant jugs as they cross the Heran River, where in some p... - Posted on August 19, 2014
12-year-old girl sells steer for $100,000 A 12-year-old girl needs a bigger piggy bank. Shaelye Varner showed the grand champion steer at the Illinois State Fair, then sold it at auction for a whopping $100,000. That shattered last year's fair record of $62,000. Large companies like AT&T, Monsanto and DeK... - Posted on August 16, 2014
Who owns this photo…Man or Monkey? When a monkey takes a selfie, who owns it? A series of self-portraits taken by Indonesian monkeys has sparked a dispute. It's between Wikipedia and a British wildlife photographer. He wasn't amused that the popular images are being used for free. This is called a co... - Posted on August 12, 2014
“But officer, I was only trying to help!” Police patrol cars are usually Fords or Chryslers, not Maseratis. So when a patrolman spotted a Maserati resembling a police cruiser, he pulled it over. Deputy Chief Wayne Foster tells The Patriot Ledger newspaper the luxury Italian vehicle's body was painted black an... - Posted on August 12, 2014
He's 16. And he's the mayor of his town. A 5-year-old boy's run as mayor is over in a tiny tourist town in northern Minnesota. Robert "Bobby" Tufts lost his bid for a third term as mayor of Dorset on Sunday. Eric Mueller, a 16-year-old from Mendota Heights, Minnesota, won. His name was drawn from the ballot box du... - Posted on August 6, 2014
Tiny words are huge gift to Scrabble players To Scrabble fanatics, big gifts sometimes come in small packages. The word "te" as a variant of "ti," is the seventh tone on the musical scale. It is a little gem among 5,000 words to be added to "The Official Scrabble Players Dictionary" next week. The dictionary's l... - Posted on August 6, 2014
If you were a crab, what color would you be? A rare blue-colored red king crab has been caught. Frank McFarland found the crab in his pot July 4. The crab is being kept alive at the Norton Sound Seafood Center. People show up to have their photos taken with it. Scott Kent, with the Alaska Department of Fish and... - Posted on August 5, 2014
Barking couldn't save deaf boy, so dog licked him A pit bull named Ace is being hailed as a hero. The dog licked the face of a sleeping, deaf 13-year-old boy to alert him that the house was on fire. Indianapolis Fire Department Capt. Rita Reith says Nick Lamb was home alone. He was sleeping without his hearing aids. ... - Posted on August 5, 2014
Does tower of ketchup need mountain of mustard? How would you like to own a towering ketchup bottle? A "For Sale" sign is in front of what's billed as the "World's Largest Bottle of Catsup." The landmark once served as a water tower in the city of Collinsville, Ill. It's old, 65 to be exact. And it's tall, 170 fee... - Posted on August 5, 2014
Rats overrun home of Mona Lisa Rats are on the rampage in the elegant garden of the world famous Louvre Museum. They romp on the grass in broad daylight. The hot weather in Paris has brought many visitors to the garden. Their garbage is a feast for the rats. The lush area gives a rat plenty of plac... - Posted on August 5, 2014
What's wrong with this selfie? Jacquie Whitt's island trip with a group of teenagers was memorable. Not just for the scenery and wildlife, but also for the way the kids preserved their memories. It was, said Whitt, a "selfie fest." For this generation, "digital devices are now part of the interpretive exp... - Posted on August 5, 2014
He’s the most popular dog on Instagram Tuna the hound peeks out from beneath his blanket. He bares his row of buck teeth for the camera. Courtney Dasher rescued the dog in 2010. The mixed-breed pooch has bug eyes, a big nose and infamous overbite. Four years later, the dog from California is dubbed a "Chiweenie" ... - Posted on June 16, 2014
Detour lets toads cross road without croaking It's rush hour in Philadelphia for thousands of baby toads. They hop across a busy street on a rainy summer night. Why do toadlets cross the road? To get to the woods on the other side. That is where they will live, eat mosquitoes and grow up to be full-sized American toads.... - Posted on June 13, 2014
How do noise cancelling headphones work? Just by covering your ears, headphones help block the sounds around you. But active noise cancellation takes a little bit more work. Different sounds have different waveforms. And a microphone on noise cancelling headphones registers the waveforms coming from the sounds aro... - Posted on June 13, 2014