28 ms·The article says that it's not caused by Piezo effects, then goes on to describe exactly that.by Johnythree 12y agoThe article says that it's not caused by Piezo effects, then goes on to describe exactly that.beambot 12y agoActually, it sounds a lot more like triboluminescence to me.msandford 12y agoI would suspect that those are actually the same thing.zamalek 12y agoBad journalism, maybe?