Everybody loves a sunny day, but in the height of summer it’s easy to get overheated, dehydrated, and sun burnt. National “Stay Out Of The Sun Day” (7/3) is about taking a day away from the sun and finding some nice, relaxing shade. But what if there is no shade to be found? This Ted Ed lesson gets into the complex nitty gritty of sun safety. Find out how the wrinkle-causing UVA rays and burn-inducing UVBs can pose a serious risk to your health (and good looks). So what can you do? Kevin P. Boyd makes the case to slap on some physical or chemical SPF daily.