When people in a specific area are more than ten times more likely to live to 100 than those who live elsewhere, odds are they're onto something.

And renowned explorer Dan Buettner was determined to find them, and learn their healthy-living secrets.

He dubbed the longevity hotspots "blue zones," and started an ongoing project of the same name. 

Buettner, the National Geographic Society and a team of scientists identify and study the regions and their common threads regarding lifestyle, behavior, diet, outlook and stress-coping mechanisms. The idea is to help other people live longer, healthier, happier lives.

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