Thabo is a young guy who lives in the city. He uses a very effective sunscreen (SPF 35) on daily basis on his
face and neck. One day on a cool completely cloudy summer day, he went to the cattle post where he spent
most of the day running errands there before heading back to the city. Since it was completely cloudy, he did
not apply his sunscreen to his face and neck that morning. To his surprise, he found out upon arrival that he had
a terrible sunburn despite the fact that it was cloudy the whole day.
Explain how it was possible for Thabo to get sunburn even though it was completely cloudy the whole day.