Grumpy Old Geeks Topics Sunlight and bacteria Topic Sunlight and bacteria 2 mentions in 1 episode The hosts discuss an article about an experiment testing whether sunlight reduces bacteria. Mentions 295: Vitamin Melanoma Nov 5, 2018 1:04:25 150-year-old advice on Sunshine being good at killing bacteria just turned out to be true. 1:04:41 Unfortunately, it can also give you melanoma.