Papercut Physics
Pre-Disclaimer: Please do not watch the attached video if you can't stand to watch blood being drawn. But by all means if you can stomach it, take this disclaimer as encouragement to continue reading.
Don't hold your breath on this one. It's very literally a video of someone giving himself a papercut in slow motion.
(helpful hint: skip to 1:25)
so how does the paper "molecular knife" muster the force to cut the skin? Like the video mentioned, it has to do with pressure exerted. Its a principle of physics that pressure is the force per unit of area that is acting perpendicular to the surface in question. We know that even though skin is weak, its difficult to apply force with your hand such that your skin breaks under the pressure. So, the incredibly small surface area of sideways paper being applied perpendicular to the skin is enough to "part the molecular sea."
Post-Disclaimer: In no way does this blog endorse self-mutilation of any kind. even if it does make you feel like micro-physics molecular moses.
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