2. The Netherlands is apparently the world's third largest agricultural exporter, despite having little land, thanks to hydroponic agriculture that uses computer-controlled feeding of high-quality chemicals. (Presumably such techniques could be applied elsewhere if there was a serious danger of food shortages.)
3. For Los Angeles residents, if there's a police helicopter hovering over your house, you can call 213-485-2600 to find out why. (I had need of this today.) Via.