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only UVB?!?
UVA causes sunburn, UVB causes skin damage, and UVC cuts right through most protections (clothing, sun block, etc. and damages sub-dermal tissue and DNA. UVC is the weakest, UVA is s little stronger, and UVC is the strongest. Does the ozone layer really only block UVB? UVB can be blocked by a sheet of paper, so I expect the ozone does more than that. Does anyone know?