Despite the missile threat, Secretary Gates said there is still time to negotiate with Tehran over the country's nuclear program.

VOA: standard.2009.09.17

"It is quite possible with an influenza virus, a pandemic influenza virus that it gets worse over time.

VOA: standard.2009.04.30

"And with regard to the burden of disease it more than doubled,it increased over that 16 year period of time about 127 percent."

VOA: standard.2010.08.10

The experts say you will see that with much increased frequency over time."

VOA: standard.2009.12.12