Twelve thousand parts per million of the gas will cause death in one to three minutes.

VOA: special.2010.02.02

So is it still being taught? "If the results of a survey we had published this year are accurate, it is being taught by about ninety percent of teachers in grades one to three."

VOA: special.2009.10.29

The event normally brings about three million Muslims from one hundred sixty countries to the holy city of Mecca.

VOA: special.2009.11.11

NASA warned the three astronauts inside about one hour before the object was to reach the area of the station.

VOA: special.2009.04.01

This has led to greater use of monovalent vaccines to protect against either type one or type three polio.

VOA: special.2010.01.18

At the age of thirty-three, he became one of the youngest doctors in the United States to hold that position.

VOA: special.2009.09.04

Digging at Pit Ninety-One was recently suspended in order to pay closer to attention to a new discovery called Project Twenty-Three.

VOA: special.2010.04.07

The event normally brings about three million Muslims from one hundred sixty countries to the city of Mecca.

VOA: special.2009.11.24

Today,the Special Olympics has grown to include about three million athletes in more than one hundred fifty countries.

VOA: special.2009.08.23

However,the cooling of about one and one-half to three degrees Celsius is only about half as strong as a real La Nina.

VOA: special.2009.09.29

In one group,the infected man or woman began to take a combination of three antiretroviral drugs immediately after being found to have HIV.

VOA: special.2011.05.18

A nineteen ninety-three movie called "Tombstone" is one of the most recent attempts to tell this story.

VOA: special.2010.02.15

In one study,infected mothers began to take three anti-H.I.V.drugs while breastfeeding for up to six months.

VOA: special.2009.07.29

And college women twenty-one to twenty-three had bigger increases than non-students in that age group.

VOA: special.2009.08.07