Surprised Scientists Find Lifeforms Six Miles Above Earth's Surface

For the first time, scientists have found lifeforms where nobody thought it was possible: floating in the troposphere, the slice of the atmosphere approximately four to six miles (eight to 15 kilometers) above Earth's surface. And not just a tiny few, but lot: 20% of every particle in that atmospheric layer are living… »1/30/13 2:00pm1/30/13 2:00pm