User blog comment:Yeit/Gol D. Roger devil fruit???/@comment-3437846-20110227122953/@comment-178.128.132.85-20110301115408

the use of sea seastone was made known from vegapunk.2 travel on calm belts.we dont know for sure that he invented it.it was never told.and knowing 4 sute that df are around 4 centuries we can assume that the wg was always reasarching a way 2 restrain them.they didnt wait 4 centuries 4 vegapunk 2 be born.