But for many of the world's poor, finding a good way to keep food cool is difficult.

VOA: special.2009.02.09

"We have not shied away from raising the difficult problems that exist and stand in the way of the people of Africa realizing their potential.

VOA: standard.2009.08.16

But by continuously linking this in a public way and in taking a firm position on it, they make it much more difficult for him to move away from sites in Poland and the Czech Republic,".

VOA: standard.2009.07.15

She says it's no easy feat. "You have to kind of deliver so much of the story through your own written texts so it's difficult in that way because you have to get a character and a point across in 140 characters or less."

VOA: standard.2010.05.07