Millennia ago, when we first began puzzling over the mysteries of the human body, one organ stood out as vital - the heart. Journey with Bill Schutt to beaches where horseshoe crabs are being harvested for their life-saving blood, and under the sea to learn about the world's most natural antifreeze, flowing through the veins of icefish. Follow him through human history as scientists hypothesize wrongly and rightly about what is arguably our most important organ, ultimately developing the technologies that have helped us study the heart with the tools that will help us regenerate it.
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