The atmosphere is about twenty-percent oxygen and eighty percent nitrogen from Earth's surface to where space begins at one-hundred-twenty kilometers up.

VOA: special.2011.04.06

"At the rate we're going,we are expected to spend one-fifth of our economy on health care within a decade.

VOA: special.2009.05.15

But as one doctor advises her patients, becoming a non-smoker is one way to gain control of your life.

VOA: special.2010.03.09

Charles Wortmann at the University of Nebraska-Lincoln says a one-time tillage may be used to correct a problem like aggressive weeds.

VOA: special.2010.09.28

To get a credit card, they will need a parent or other adult over twenty-one to accept joint responsibility.

VOA: special.2009.05.28

But one activity that legally is only supposed to be for people age twenty-one and over is drinking alcohol.

VOA: special.2009.08.07

A study found that those snacks add up to almost one-third of all the daily calories eaten by children.

VOA: special.2010.03.17

The number of students taken to hospitals increased one and a half times from nineteen ninety-seven to two thousand seven.

VOA: special.2009.08.13

It needed much more power than the rockets used to launch the one-man Mercury and the two-man Gemini flights.

VOA: special.2009.07.08

The World Health Organization says the United States has forty-one births for every one thousand girls age fifteen to nineteen.

VOA: special.2010.05.13

As many as one hundred crystals may join to form a snowflake larger than two and one-half centimeters.

VOA: special.2011.01.11

Rick Sharga from RealtyTrac says up to one-fourth of all homes that still have a mortgage loan balance are in this situation.

VOA: special.2011.01.24

So what happens? He gets a title shot outdoors in the ballpark, and what do I get, a one-way ticket to Palookaville.

VOA: special.2009.11.30

The Treasury says it expects banks to repay one hundred seventy-five billion dollars of TARP money this year.

VOA: special.2010.01.01