Have you ever tried to turn a #postcard on and off again?
No? Then get creative at 39c3 馃槉 I bring handmade stamps, UV-visible ink pads, and photons with the right wavelength 馃挕
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Have you ever tried to turn a #postcard on and off again?
No? Then get creative at 39c3 馃槉 I bring handmade stamps, UV-visible ink pads, and photons with the right wavelength 馃挕
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