It’s sunscreen season—there are aisles devoted to it in drugstores and stacks at supermarket checkout stands. A new study published in Pediatrics shows that melanoma rates have increased among children and teens at two percent a year from 1973 to 2009—the American Cancer Society predicts that the condition will affect nearly 80,000 people in 2013. Yes you know that UVA fights aging and UVB combats burning. But do you know what’s safe—and what works? You could get a degree in toxicology and try to decipher the ingredient list on the back of the bottle, or you could take the lazy mom’s way out.