As the days get longer and the weather warmer that means one thing - more time spent outside in the sun.  Already many of us are venturing outdoors enjoying the warm spring days but there is one thing we must always do before we head outside – put on our sunscreen.  We’ve always known sunscreen use of SPF 30 or higher prevent sunburns but now researchers have proved it can also prevent melanoma, the most common form of cancer in the United States.