Austrian and Japanese researchers on Wednesday unveiled solar cells thinner than a thread of spider silk that are flexible enough to be wrapped around a single human hair. The thin-film device, comprising electrodes on a plastic foil, is about 1.9 micro-metres thick, a tenth the size of the thinnest solar…
Japanese researchers have created a “gun” that enables its user to silence the speech of other people. The device uses a unidirectional microphone to record the speaker’s voice, then play it back to them at a delay of hundredths of a millisecond. The wash of verbiage disrupts the concentration of…