In the past, we watched doctors repair a heart with tiny tools inserted through three small incisions, with no chest cracking. We witnessed a big blood clot being pulled out of the brain of a stroke victim almost like a cork from a bottle of wine, followed by a complete recovery. And we saw a paralyzed man draw pictures on his computer, change the channels on his TV and open his curtains -- just by using his thoughts. These advances seemed mind-boggling at the time, but they're becoming state-of-the-art treatments.
This year brings more excitement. From skin cells transformed into tissue beating like a human heart to a simple checklist that's saving thousands of lives, it was another banner year for breakthroughs. Some are available now; some need more work before they're ready for prime time. But all will make you say "wow."


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