Researchers at USC’s Information Sciences Institute produced this amazing pyramid, around 30 microns across, which may one day be used to deliver precise micro- or nano-doses of medication. The structures, dubbed “voxels” are made of silicon, cut into flats and then folded up and sealed to enclose tiny volumes of space inside. The team hasn’t stopped at pyramids either— they’ve tried flat envelopes, cubes and partial dodecahedra, but these don’t close together the way the pyramid does.