Another reason for the increase in bird strikes is the growing popularity of air travel in the United States.

VOA: special.2009.04.01

He says the increase in milk production reached a high of more than six kilograms per cow per day.

VOA: special.2009.05.12

The researchers did not try to identify the causes of the increase, but they have some theories.

VOA: special.2009.08.06

Doctor Murray says at least part of the increase is likely the result of better record keeping.

VOA: special.2010.04.14

Researchers believe the increase in heart rate might demonstrate what they call the fight or flight response.

VOA: special.2009.08.18

At the hearings, one of the subjects discussed was the increase in populations of large birds in North America that could threaten other planes.

VOA: special.2009.06.13

She says the increase in income has a huge effect on the whole community as well.

VOA: special.2010.06.16

They found that the increase took place only in areas with hospitals where new doctors train.

VOA: special.2010.07.13

The researchers say larger class sizes are another possible reason for the increase in injuries.

VOA: special.2009.08.06

The main reason is the increase in the number of visitors to the islands.

VOA: special.2009.12.16

The researchers say weight gain is probably to blame for the increase.

VOA: special.2010.01.13

The increase appeared to be driven by a 1.8 percent spike in wholesale prices, largely due to higher energy prices.

VOA: standard.2009.07.14

With U.S.casualties in Afghanistan on the increase, the president is considering requests from his military commanders for more troops.

VOA: standard.2009.11.16

Scientists at CSIRO, Australia's government-funded scientific research institute, say that climate change has played a role in the increase.

VOA: standard.2009.11.09