Experts say heat waves often become dangerous when the nighttime temperature does not drop much from the highest daytime temperature.

VOA: special.2010.07.27

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

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

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

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

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

Those with the highest winds that destroy well-built homes and throw vehicles more than one hundred meters are called an F-five.

VOA: special.2010.05.11

Still,murder rates in the United States have generally been among the highest among Western democracies since the middle of the nineteenth century.

VOA: special.2009.12.19

He was influenced at the age of nine by a painting in his school of the highest mountains on the seven continents.

VOA: special.2010.06.30

Today we tell about the highest level of men's soccer in the United States - Major League Soccer.

VOA: special.2010.06.02

Swaziland is said to have the highest known rate of infection for the virus that causes the disease.

VOA: special.2009.05.04

He says that teenagers should set the volume control on their music players to somewhere between one-half and two-thirds the highest level,never louder.

VOA: special.2010.09.28

Twelve women have won the Nobel Prize in science, one of the highest honors in the world.

VOA: special.2009.05.13