Background Most people I know prepare for medical emergencies by buying a first-aid kit, maybe taking a class, maybe buying some additional supplies, and calling it good. In an urban setting we typically expect to have professional assistance in less than an hour, but natural or man-made disasters could change this to days, weeks, months – or longer. I often work and play outside – skiing and motorcycles, construction and heavy-equipment, and off-grid living. I’ve fallen from horses, bicycles, and a roof. I live in earthquake and volcano country, and I’ve helped raise three sons. I’ve been motivated for more …