They found the highest levels of solar activity cause small, but far-reaching effects on weather systems around the world.

VOA: special.2009.09.29

President Obama wants the United States to again have the world's highest percentage of college graduates by two thousand twenty.

VOA: special.2009.09.10

Then, almost two years since announcing his candidacy for America's highest office, Mr. Obama began the work of president.

VOA: special.2009.01.24

The president wants the United States to regain the world's highest college graduation rates, especially in math and science.

VOA: special.2009.07.30

A year later,President Clinton awarded him the Presidential Medal of Freedom, the highest civilian honor in the United States.

VOA: special.2009.09.06

A year later, the president of the United States, Jimmy Carter, honored the social scientist with America's highest award for civilians.

VOA: special.2010.01.17

The government decided to give him the highest award of the Atomic Energy Commission for his work on atomic energy.

VOA: special.2009.06.14

In sub-Saharan Africa we have the highest death rates in the world, and they are around seven times higher than that."

VOA: special.2009.09.28

The report says ten of the countries in Africa with the highest cases of malaria have reported decreases in new cases.

VOA: special.2010.03.10

An American stuck in London, already one of the world's highest priced cities, found that her hotel had doubled its prices.

VOA: special.2010.04.23

In the United States, the legal age to drink alcohol is twenty-one -- one of the highest in the world.

VOA: special.2009.04.02

Since nineteen fifty-three, more than ten thousand people have attempted to climb to the top of the world's highest mountain.

VOA: special.2010.06.30

A year later, the president of the United States, Jimmy Carter,honored the social scientist with America's highest award for civilians.

VOA: special.2011.07.03

This year's federal deficit is already predicted to be the highest in relation to the economy since World War Two.

VOA: special.2009.07.10