A new statistical analysis of Airbnb listings shows the short-term-rental service is growing worldwide, but suggests that many hosts don't stick with it. Intermittent commercial uses of residences could be seen in the planning context of "mixed use."
Donald Trump invokes the darkest days of urban decay and crime to appeal to his base. The facts speak to an urban triumph that has led to greater national prosperity and higher standards of living for tens of millions of Americans.
If the U.S. Air Force has its wish, America's next subway system won't be built in a city and won't carry passengers (not human ones anyway). Robert Beckhusen reports on plans for a "mobile doomsday train."