A 13-year old uses math (hooray for the Golden Ratio) to figure out a new and more efficient arrangement for solar panels. The trick: mimic trees! For extra credit, here's more on why so many plants have spiral patterns related to the Golden Ratio.
An urbanist's paean to on-street parking. I'm not sure I agree with every piece of the argument, and I certainly don't think that we should presume that drivers have an inherent right to use public right of way to store their vehicles. But compared with many of the alternatives---especially surface parking lots or monolithic garages at street level---street parking seems like a pretty good option for pedestrian-friendly design.