Sunscreen doesn't block cosmic rays, those are high energy atomic nucleus (that are normally filtered out by the atmosphere), not high energy photons/light (tha

Sunscreen doesn't block cosmic rays, those are high energy atomic nucleus (that are normally filtered out by the atmosphere), not high energy photons/light (that end up on beaches). Did you previously find scholarly studies that suggest wearing sunscreen helps with melanoma, or did you just see high melanoma incidence rate in frequent flyers, and assumed sunscreen will help?