How And Why We Tan

As summer progresses, I find myself spending more time outdoors and have naturally acquired a slightly darker complexion than during the colder months. While at the beach with family, we discussed our varying abilities to tan. Some of us had yet to achieve a noticeable tan, while others were well on their way. We all agreed that with more time in the sunshine, we would soon have a deeper tan. It made me curious about the science behind tanning and why our skin changes color in the first place.