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The limousine carrying President John F. Kennedy races toward the hospital after he was shot in Dallas on Nov. 22, 1963, with Secret Service agent Clint Hill riding on the back.

How Kennedy's Assassination Changed The Secret Service

The Secret Service made some immediate changes after the president's death 50 years ago this month: Open limousines were out. And it began taking a more aggressive approach to its advance work. Over the years, the service has established counter-sniper units, assault teams and surveillance units.

Shelburne Farms' clothbound cheddar has a bright yellow color because it's made from the milk of cows that graze on grasses high in beta-carotene.

How 17th Century Fraud Gave Rise To Bright Orange Cheese

Kraft says it's ditching two artificial dyes in some of its macaroni and cheese products. But why did we start coloring cheeses orange to begin with? Turn's out there's a curious history here.

Abdulnasser Gharem's 3-foot tall stamps are larger-than-life interpretations of the bureaucratic seals he employs in his day job — as a lieutenant colonel in Saudi Arabia's army.

Saudi Soldier Questions Authority With Art (And Plastic Wrap)

Abdulnasser Gharem is revolutionizing the contemporary art scene in Saudi Arabia with performance art and installations that chafe against his country's bureaucracy. A lieutenant colonel in the army, Gharem skirts potential censorship by exhibiting his boldest, most critical pieces outside Saudi borders.

Twitter's Value Soars To Nearly $25 Billion

Shares of Twitter stock went on sale to the public on Thursday. They immediately climbed more than 70 percent above the offering price of $26 a share.

A Complete Curmudgeon's Guide To 'The Sound Of Music'

Well, sure. You could choose to think all the good things about The Sound Of Music, but you could also chose to think all the weird things. (Besides the fact that NBC has decided to remake it.)

Hunger Games: What's Behind Yelp's Fake Restaurant Reviews?

Restaurants with a "weak" reputation are more likely to write fake positive reviews, a study finds. But chain restaurants, which do not benefit greatly from Yelp, are less likely to commit review fraud.

Oct. 29, 2004: Palestinian leader Yasser Arafat boards a helicopter in the West Bank city of Ramallah en route to a hospital in France. He died weeks later.

Palestinian Investigator: Israel Is 'Only Suspect' In Arafat's Death

The comments come on the heels of separate reports by Swiss and Russian scientists that purportedly found elevated levels of polonium in and around the late Palestinian leader's remains. But the investigator refused to say whether he believed Arafat died from polonium poisoning. Israel has denied any involvement.

How It Sounds: To Be A Sound Guy

A thunderstorm, a gunshot, classroom buzz and ivory keys — a quartet of sounds that reveal the life of a sound guy.

National Geodetic Survey crew members Roy Anderson, left, and Steve Breidenbach set up survey equipment used to measure the height of the Washington Monument.

How Tall Is The Washington Monument? Surveyors Take To The Top

The last time the monument's height was measured was in 1999. And with scaffolding in place for earthquake repairs, engineers have a rare opportunity to take official measurements of the iconic obelisk.

The Myth of the Woolly Bear

Legend holds that the length of a woolly bear caterpillar's color bands can be used to forecast how severe the winter weather will be. The myth dates back to colonial American folklore but was popularized by a 1948 study. SciFri finds out if there's any truth to the lore, and what the caterpillar's fuzzy bristles are really used for.

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