Steven Johnson: Why We're Living Longer : TED Radio Hour In the last century, human life expectancy has doubled. This hour, we talk with writer Steven Johnson on the many breakthroughs that made this possible — and where we go from here.

TED Radio HourTED Radio Hour

Life's biggest questions, explored.

Steven Johnson: Why We're Living Longer

In the last century, human life expectancy has doubled. This hour, we talk with writer Steven Johnson on the many breakthroughs that made this possible — and where we go from here.

Bret Hartman / TED

Steven Johnson: The Past, Present, and Future of the Human Life Span

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TED Radio HourTED Radio Hour

Life's biggest questions, explored.