Why would I do that?
Geekiness aside. We started learning all the countries of the world a few months ago and have been doing quizzes on and off ever since. I have been surprised how much it actually increases my understanding of the news and my confidence when I interact with people. I met someone from Liberia the other day. In the past I would have been "ok, somewhere in Africa but not actualy idea where". Now I can point it out. This person had gone across part of the Sahara to Libya and ended up in Italy. I could picture his journey. Picturing the trajectory really helped*.
*Yes, I know there are probably a lot of people thinking "only an idiot would have no idea where Liberia was in the first place" and I can only agree but I am trying to make up for lost time!