Greatest persons in history/present.

Yan Zhitui - the first man in history to mention the use of toilet paper.

Joseph Gayetty - the first man who popularized toilet paper for the masses.

Where would civilization be without toilet paper?
 
In the crapper?
 
Darwin.

/ego trip
 
That's a myth.

It's a myth he gave his name to the crapper and thus to crap, he just had an impossibly aposite name. It's true he invented both the ballcock and a design of toilet so widespread it still exists today - there is one in my flat about ten yards away :) He invented the flushing toilet to about the same extent that Edison invented the lightbulb.
 
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