I sat for 45 minutes last summer in the hot sun (100°F/38°C). I was pinned in on the bleachers so I wasn't able to get up and move. I could feel the sun burning through my pants. Now I have everyday ...
All over the internet it says that sunscreen does not work all day, but does not say anything about why. Why does sunscreen not work all day? Does the matrials get destroyed by the UV rays? Or is it ...