Storm frequency,he says, comes in cycles of 30 years.

VOA: standard.2009.12.21

California approves traditional textbooks in six-year cycles.

VOA: special.2009.08.27

Hearst and his partner, Ben Gluckstern, launched a bike-sharing program called NY Cycles in 2009.

VOA: standard.2010.01.31

"That is how we will restore trust and confidence in our markets." "That is how we will help to put an end to the cycles of boom and bust that we have seen.

VOA: standard.2010.04.24