"Ultraviolet radiation can neither be seen nor felt," the study noted."
Not true.
You'll see it and feel it right after you get a nasty burn from being in the sun too long!
Been there. Done that.
Boy! So have I. We used to go to the beach every summer when I was a kid. I remember being burnt so badly that I just lay in bed all night not moving. Mom rubbed Noxema all over me. Noxema. Go figure.