For there to be a cycle, some condition or situation must recur over a period of time.

FORBES: Expect Two Recessions Before End Of Decade

It is generally stipulated among political experts and interested observers of the 2012 election cycle that the presidential contest will be heavily weighted toward the condition of the economy, especially unemployment.

FORBES: Create Jobs In All Crayola Colors

Obesity increases the chances of developing sleep apnea, a condition that combines choking and waking in an exhausting, sometimes life-threatening cycle.

NEWYORKER: Up All Night