Someone else will be able to give a scientific explanation, but the sun is just different at heights. I used to have famiy both in La Paz and Quito and just 15

Someone else will be able to give a scientific explanation, but the sun is just different at heights. I used to have famiy both in La Paz and Quito and just 15 days in one of those places -- dressed for cold --made me as brown as two months going to the beach in coastal Brazil.