During this period, hair grows at a rate of about three tenths millimeters a day, or one centimeter a month.

VOA: special.2011.04.05

Laboratory marmosets increased weight at a rate of nine percent per ten-year period.

VOA: special.2010.12.21

Republicans have a plan to insure three million more Americans at cost of $60 billion for the same period.

VOA: standard.2010.02.25

Researchers at the University of North Carolina-Chapel Hill studied the eating habits of American children over a 30-year period.

VOA: standard.2010.03.09

At this point, it is a period of rains and people are able to fish."

VOA: standard.2009.08.08

"I do not think a prolonged period of uncertainty is a good thing, that is why I want to arrive at a decision, we want to arrive at decision, as soon as possible."

VOA: standard.2010.05.10

Security officials in Massachusetts say there are no known threats to Boston and that Thursday's raids at a suburban home and a fuel station followed a period of close, confidential contact with New York's police department and federal agents.

VOA: standard.2010.05.14