The findings suggest that even a half-hour walk at a quick speed every day could lower the risk of cognitive impairment.

VOA: special.2011.07.27

At the end of the test flight,the speed of the Apollo spacecraft was increased to forty thousand kilometers an hour.

VOA: special.2009.07.08

Before the flight went down, sensors gave conflicting information on air speed to the plane's computers, possibly because of ice.

VOA: special.2009.06.13

But to a new generation of high-speed communicators, a tweet describes a message sent through a popular new service.

VOA: special.2009.02.06

He says a new system is needed to meet the speed and complexity of a twenty-first century global economy.

VOA: special.2009.06.19

Super-fast Internet connections let people watch movies and send huge amounts of information at the speed of light.

VOA: special.2010.09.01

Toyota has recalled more than eight million vehicles worldwide over a risk of gaining speed suddenly and uncontrollably.

VOA: special.2010.02.26

It enables the user to control the speed and sound levels of orchestral music playing on a computer.

VOA: special.2011.05.11

The first plane ever to fly faster than the speed of sound was the X-1 in nineteen forty-seven.

VOA: special.2010.07.07

They said the overall strength of storms measured by wind speed might increase two to eleven percent by the year twenty-one hundred.

VOA: special.2010.08.24

But blood drops with long tails can tell a great deal about the direction, speed and angle of the blood's starting point.

VOA: special.2010.05.05

Tornadoes usually travel in a northeasterly direction with a speed of thirty-two to sixty-four kilometers an hour.

VOA: special.2010.05.11

He developed a plan for measuring both the distance and speed of as many galaxies as possible.

VOA: special.2009.04.29

Mister Rowan's columns led to the resignation of its chairman and helped speed the organization's financial recovery.

VOA: special.2009.11.01