One in five U.S. residents will develop skin cancer by the age of 70. But by following a few simple steps, you can greatly reduce your risk of skin cancer. Get the facts in this quick quiz by dermatologist Adam Sutton, MD, MBA. You don’t need to wear sunscreen if it’s cloudy. True False Applying sunscreen once a day is enough. True False You should wear sunscreen in the car. True False The higher your altitude, the more exposed you are to the sun. True False Sunscreen with broad spectrum protection is best. True False It’s best to apply sunscreen the minute you get in the sun. True False The sun is most intense between 10 a.m. and 4 p.m. True False Having a base tan prevents sunburn. True False One to two ounces (the size of a ping pong ball) is the right amount of sunscreen. True False