Also, he said, the people who have died in Mexico could have had what he called "another co-factor, " such as taking medicine or having pre-existing infections that would make them more vulnerable.

CNN: Among the swine flu mysteries: Why only deaths in Mexico?

Sources say Rimes is interested in joining the Fox reality hit, with one source adding that she's met with "Factor" co-producer FremantleMedia North America about the gig and other opportunities.

CNN: LeAnn Rimes interested in 'X Factor' judges post

Be honest with yourself and factor in personal compatibility with co-workers and management.

WSJ: Turn a Firing or Layoff Into a Learning Experience

Not long ago, I spoke with Mallory Factor, a Republican fund-raiser and the co-organizer of a monthly meeting for conservative thinkers and activists in New York.

NEWYORKER: On the Bus

Factor your annual deductible, doctor-visit fees, and drug co-pays into your budget, Allvine says.

CNN: How to prevent a medical bill disaster

In his latest book, " Return on Strategy: How to Achieve it" Poulfelt and his co-authors examine how companies can reap maximum benefit by using their unique X-Factor as a strategy.

CNN: Have you got the career X-Factor?