If spongebob is a sponge how can't he swim

to begin with he's already underwater several feet down and has done absorbed water to begin with so there for it makes him heavier and harder for him to swim.

sponges soak up water, and when they do they get heavier so thats why he cant swim

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".