Aim for at least 30 minutes five days a week for osteoporosis prevention and optimal health.

CNN: How much weight is needed to strengthen my bones?

In countries such as the United Kingdom, which expects a nursing shortage within the next five years, the focus is on disease prevention and public health to reduce the overall number of patients.

CNN: Where have Europe's nurses gone?

According to a new study by the Centres for Disease Control and Prevention (CDC), which looked at five cities with high numbers of gang murders between the years 2003 and 2008, drug trading or usage and other criminal activity ranged from zero to 25% of all gang-related killings.

ECONOMIST: Gang violence

Krusinski was placed in charge of a section of the service's sexual assault prevention and response program in February, running a five-person office, the Air Force official said.

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Jeffrey Krusinski was placed in charge of a branch of the Air Force's Sexual Assault Prevention and Response program, and he oversaw a five-person office, an Air Force official told CNN after the incident.

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Women with post-primary education are five times more likely than illiterate women to be educated on HIV prevention.

UNESCO: EDUCATION

Women with post primary education are five times more likely than illiterate women to be educated on HIV prevention.

UNESCO: SERVICE DE PRESSE

At 30 below zero Fahrenheit, frostbite can occur in as little as 10 minutes with the slightest winds, and in five minutes in a brisk breeze, the Centers for Disease Control and Prevention warns.

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People are generally contagious the day before symptoms start, and for five days after becoming sick, according to the Centers for Disease Control and Prevention.

CNN: Flu picks up steam across the U.S.