One of my favorite things about Park Slope are the gas lamps that you see in front of some houses. They don't actually illuminate much, but you have to admit that they're beautiful to look at, and Park Slope is one of the only neighborhoods left with the gas infrastructure needed to power the lamps. But what happens when they break? The Wall Street Journal's Metropolis blog ran a great video today about what it takes to keep these gas lamps working. If you have a few minutes, it's really interesting.