It beats 100,000 times every day--if you were to live to 100, that would be more than 3 billion beats across your lifespan. Despite decades of effort in labs all over the world, we have not yet been able to replicate the heart's perfect engineering. But, as Sian Harding shows us in The Exquisite Machine, new scientific developments are opening up the mysteries of the heart. And this explosion of new science--ultrafast imaging, gene editing, stem cells, artificial intelligence, and advanced sub-light microscopy--has crucial, real-world consequences for health and well-being.