the most populous city in the world?

so i am here in mexico city since yesterday i missed my connection to bogota, i stressed out for about an hour, then started bitching at the people in charge, so i finally got on the same plane today, plus i got a nice hotel room and three meals from them...so life is not that bad at all, i am actually glad i did miss that plane! haha i took a nap, watched some soccer from my room, then went into the center by metro straight from the airport, walked around the zocalo (big square) and the surrounding area, then came back and went to sleep...now i am rested (since i was not when i left texas!) so i am ready to tackle colombia and venezuela!