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

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

But in the western United States, there are highways where the speed limit is one hundred twenty-five kilometers an hour.

VOA: special.2010.04.26

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

VOA: special.2010.09.01

A newly released proposal calls for almost everyone in the United States to have high-speed Internet service at home within ten years.

VOA: special.2010.03.19

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

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

VOA: special.2010.05.11

You can take a high-speed boat trip for about an hour to the Dry Tortugas National Park.

VOA: special.2010.03.22

In June,the Speed Sisters became the first all-female racing team to compete in the Speed Test, a popular race in the West Bank.

VOA: special.2010.07.30

The scanner uses a high-speed camera placed over the conveyer belt that moves the produce along.

VOA: special.2011.06.07

Earlier in the week, the head of the World Bank said international support can speed progress -- "but only if coupled with real reform."

VOA: special.2011.05.27

Scientists use the Saffir-Simpson Hurricane Scale to measure the intensity of storms based on wind speed.

VOA: special.2010.08.24

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

VOA: special.2010.05.14

The American buffalo could run at the speed of almost seventy-five kilometers an hour.

VOA: special.2009.02.15

These products have names like Red Bull, Monster,Ripped Force, Speed Stack and 5-Hour Energy.

VOA: special.2009.07.22

That is just under the wind-speed of a hurricane,a very severe ocean storm.

VOA: special.2010.10.19

Physicists use super-powerful magnets to speed particles and control radiation like X-rays.

VOA: special.2010.10.08

It would reach hypersonic speeds -- five times the speed of sound.

VOA: special.2010.07.07

The X-15 set height and speed records greater than those expected.

VOA: special.2010.07.07

They ride high-speed elevators that go deep inside the dam.

VOA: special.2009.08.12

The F.C.C.currently defines high-speed Internet as an information service.

VOA: special.2010.05.21

His speed was twenty-eight thousand kilometers an hour.

VOA: special.2009.06.17

Its speed was twenty-nine thousand kilometers an hour.

VOA: special.2009.07.15