Or,it can be severe. The National Headache Foundation says more than forty five million people in the United States suffer chronic headaches.

VOA: special.2010.03.30

The number of infected men, women and children is estimated at more than five and a half million -- or eleven percent of the population.

VOA: special.2010.04.28

The goal is to help an additional five million students earn degrees or certificates.

VOA: special.2009.07.16