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There's more health advice available than ever before — and no easy way to tell what’s worth your time. From biotech breakthroughs to smarter cancer screening, physician Dhruv Khullar and microbiologist Zack Abbott examine what happens when science can change who we are — including the potential of reengineering the human body — and what medicine might look like in 20 years. (This conversation is part of “TED Intersections,” a series featuring thought-provoking conversations between experts navigating the ideas shaping our world.)