The Old Fire crossed Highway 18 near Lake Arrowhead, California on 28 October 2003 before racing into the community of Cedar Glen as a crown fire and destroying most of the homes there. photo source: Firestorm from NationalGeographic
Snack time: GPS trails reveal the routes taken by cycling pizza delivery riders on one Friday night in Manhattan. Each rider's shift lasts eight to nine hours, in which time they can deliver between 30 and 40 pizzas all over the city. I love heat maps.