One mystery gripping this part of the UK is the mysterious "body parts" murder, where part of a dismembered victim have been left near the roadside in several locations: Wheathampstead, Puckeridge and Cottered in Hertfordshire and the head was dumped in Asfordby, Leicestershire.
Given that the Puckeridge part was reportedly left by the northbound carriageway, that gives a clue as the the direction that the "dumper" was travelling. And making an assumption that the head was the last part to be dumped because it was the furthest away from the others, then you can take these four data points and plot them into Google Maps.
You can see more here. Of course, speculation is just that, but if does appear that the dumper did a loop around Hertfordshire perhaps near the A414, A10, A507 and then drove up the A1 for about an hour before turning off. Yes, there's a technology aspect here - a tool like Google Maps makes it very easy to visualise this sort of data.
OK, this is all pretty gruesome and don't forget that someone has lost their life. But there's a grim fascination as to where the next discovery will be. Will that fit into the pattern?