Nanodiamonds are produced under only a very high temperature and high pressure event, such as a comet striking Earth.

VOA: special.2009.01.20

The causes of heat stress include wearing heavy clothing, physical work or exercise, hot weather and high humidity.

VOA: special.2011.08.09

The writer says she saw these Indians as time-travelers moving away from tradition and an eventless youth, heading into an exciting and high-tech future.

VOA: special.2011.07.13

High blood pressure and high cholesterol levels in blood can increase your risk of heart disease.

VOA: special.2011.06.28

Some critics partly blame the crisis on Americans' low savings rate and high personal debt.

VOA: special.2009.04.10

The plunge renewed debate about the risks of electronic exchanges and high-speed computer trading systems.

VOA: special.2010.05.14

But it also has struggled with racial division, poverty and high rates of HIV/AIDS infection.

VOA: special.2010.06.09

Corn,or maize,is mostly fed to animals or made into ethanol fuel and high-fructose corn syrup.

VOA: special.2010.12.07

Aspirin competes with many other medicines for reducing pain and high body temperature.

VOA: special.2010.12.14

That was forty years ago, a time of civil disorder and high crime.

VOA: special.2009.02.28

Heavy snow and high winds damaged some of the city's cherry trees.

VOA: special.2010.03.16

Programs begin in elementary school and continue through middle and high school.

VOA: special.2009.11.27

Heavy snow and high winds damaged some of Washington's famous cherry trees.

VOA: special.2010.02.23

These include eating disorders, fear disorders and high blood pressure.

VOA: special.2009.03.24