Kate Carleton, center, teaches children at a California elementary school how to stop a wound from bleeding out. CNN

Kate Carleton, center, teaches children at a California elementary school how to stop a wound from bleeding out. CNN

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Born from the tragedy of gun violence, this program teaches children how to stop a wound from bleeding out

When I visited Rocklin Elementary school, I sat in on a lesson with a third-grade class – a lesson I would never have imagined as a father, a journalist or a trauma surgeon.