Basically, they used the advanced, expensive microscope to etch ad spots into actual tiny beard hairs a Gillette user had shaved off, then blew up the images for their ads. They even had QR codes for the ads in men's airport bathrooms next to the sink, since that's where guys tend to shave and freshen up after a flight. To see scientists using the electron microscope to create the ads, just keep reading.
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Instead of its usual "skin so smooth a random hottie will appear to stroke your legs/face" ads, Gillette has decided to go in a different direction, one that involves, oddly enough, a high-powered electron microscope.