When it comes to fighting back against the harmful effects of the sun’s UV rays, a layer of SPF is arguably the single most important step in a skin-care regimen. Though we have all become a little more knowledgeable about protecting our skin from the sun, not many people truly understand what to look for in a sunscreen and how hard it works for our skin. So, we sat down with our research team, dermatologists and cosmetic chemists to answer your burning questions. Do I really