MYTH: Standing in the shade protects you from UV damage.
FACT: Just because you can't feel the sun on your skin doesn't mean ultraviolet radiation isn't there. As you, say, walk to work on the shady side of the street, sneaky diffuse irradiation (scattered solar beams) present in the atmosphere during daylight hours accounts for a whopping 80 percent of your annual dose of UV exposure. "Sun damage is cumulative," explains New York dermatologist Dr. Debra Jaliman, so you simply must wear SPF 30 broad-spectrum sunscreen all year round. "Even when it's cloudy, the sun penetrates through," she says.