“My husband and I talked about it and decided that even if it didn’t save me, if it could help someone else, I had to do it.” It was a warm, foggy day in 1970 when Pam Roach, then a high school sophomore, spent a rare and cherished day at Lake Michigan with friends. She soaked in the summer air, lying on the sand for hours, careful to wear sunscreen, but she underestimated how powerful the sun’s rays could be, even through the clouds. By the end of the day, Roach had developed a severe sunburn, s...