Seems to me like we should’ve easily invented something that lasts indefinitely by now
In: Chemistry
things in general have a hard time sticking to the surface of our skin. movement, sweat, ocean water tend to clear away most “stuff” that gets stuck or placed on skin
a sunscreen that lasted indefinitely would likely cause harm to your body by possibly blocking the natural exchange of heat and sweat
then there is the chemical component; of how long can the sunscreen last before being broken down by the very thing its protecting us from?? ever leave stuff out in the sun only to find it faded/melted or otherwise changed
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