00:00Right now, your face is made of cells that had to walk across your skull just to build you.
00:08Meet the neural crest.
00:10In the womb, these are the ultimate explorers.
00:13They aren't born where they end up.
00:16They literally crawl through the dark,
00:19traveling massive distances through your developing body to find their final home.
00:24One cell might travel to your jaw, another to your ears,
00:28and some even to your heart.
00:31It's a high-stakes migration where one wrong turn changes everything.
00:37They use chemical sense to navigate,
00:40acting with a collective bravery to assemble the human form from scratch.
00:45You aren't just grown.
00:47You were built by billions of tiny explorers who found their way.
00:52But how do they know where to go?
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