Today, being outdoors on a hot, sunny day usually means traveling with a few sun-blocking essentials: sunscreen, sunglasses, and a hat. Though our knowledge of sun damage is relatively recent — it wasn’t until the 1800s that scientists began to understand ultraviolet rays’ harmful potential — humans have always tried to avoid the unpleasant sting of too much sun. Yet the first commercial sunscreens didn’t arrive until the 20th century — before that, people had to find other ways to prevent getting a sunburn. Credit: Print Collector/ Hulton Archive via Getty Images  Clothing and Shade ...Read More