Wikipedia is darn dangerous like that. I went to look up "soldering iron" and found a featured article about an astronomical organization redefining the term "planet" which may include three more in our solar system. Of course, I had to read about all three (which I'd seen mentioned in previous Wikipedia sidetracks like this). This lead me to reading about the 40 year old Deep Space Network with led me to Mars Spirit and Opportunity, which led me to their photo gallery. Two and a half hours later, I still hadn't learned anything about tinning the tip of a soldering iron.