Alivia Parker, 21 months at the time, ran through circles of spraying water on a hot day in Montgomery, Ala., last June. She was wearing sunscreen with an SPF of 100, a rating that won't be allowed much longer. Dave Martin/AP hide caption

Hair stylists already spend a lot of time staring at the back of people's heads. Researchers thought: Why not train them to check for suspicious lesions and other signs of skin cancer while they're at it?

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Roche Genentech developed a new melanoma drug for people with advanced cases. FABRICE COFFRINI/AFP/Getty Images hide caption