Dr. Theodore Schwartz has been treating neurological illnesses for nearly 30 years. He says being a brain surgeon requires steady hands — and a strong bladder. His new book is Gray Matters. Learn more about sponsor message choices: <a href="https://podcastchoices.com/adchoices">podcastchoices.com/adchoices</a> <a href="https://www.npr.org/about-npr/179878450/privacy-policy">NPR Privacy Policy</a>

Migrants Risk It All On The Treacherous Darién Gap

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