Singapore is the world's 6th Blue Zone — and a look at its urban planning helps explain why

• Singapore is the world's sixth Blue Zone, according to Dan Buettner, a journalist who popularized the term.
• In the Netflix series "Live to 100," Buettner shows how the country is designed to encourage its residents to live healthier.
• Policies on housing, transportation, and hawker centers come together to create what he calls a "Blue Zone 2.0."

Singapore is the world's sixth Blue Zone, according to Dan Buettner, a journalist and researcher who popularized the use of the term to describe regions in the world where people live longer and healthier lives.