Time Travel

This afternoon my cousin and I were pedaling our recumbents along the Joe Rodota bike trail when we caught up with a guy riding a Rans recumbent. That was rare for us. We seldom catch anyone and never catch a recumbent. We exchanged greetings and were about to move on when the dude said that he had a gadget he wanted to show us. We stopped. The gadget turned out to be a tiny camera, about the size of a finger, that pointed out from under his helmet.  This camera recorded everything in front of it on a five hour loop. Nothing on it was permanent unless you pressed a button, and then the prior 17 seconds became semi-permanent. In other words, if you saw something odd and wanted a record of it, the camera would dip back into the past and keep a short video. This time machine cost about $150 and ran on almost no power.  Amazing!