A priori

Something new I learned today, courtesy of Wikipedia:

Galen Strawson wrote that an A priori argument is one of which "you can see that it is true just lying on your couch. You don't have to get up off your couch and go outside and examine the way things are in the physical world. You don't have to do any science." There are many points of view on these two types of assertion, and their relationship is one of the oldest problems in modern philosophy.