Sort of an odd question, but I figure there are a few eggheads on this forum, so I thought I'd ask here. In light of the new discoveries of potentially habitable worlds, larger than Earth, I was wondering, what is the highest gravity humans could live in? I.e. without suffering serious health problems. 1.5 G? 2 G? In science fiction they rarely seem to put any thought into this, and most planets apparently not only have a breathable atmosphere, but a gravity that won't turn humans into paste.