The common cold is the most frequent cause of lost workdays in adults who are younger than 45. What would you guess comes in as the second-most frequent medical cause of lost time on the job?

* Answer on S5.

POP QUIZ ANSWER: Low back pain. Four out of five adults will experience significant low back pain sometime during their life, reports the American Academy of Orthopedic Surgeons. (Question on S1.)

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