But for people who have a difficult time controlling their movements, this little navigational issue can be a really big problem.

VOA: special.2011.04.18

Tina is shopping with Kevin, and they say the difficult economy forced them to Christmas shop a little differently this year, to save money.

VOA: special.2009.12.21

And my center of gravity is a little bit lower." "I feel like sometimes it is a little more difficult to knock me down.

VOA: standard.2010.02.09