While reading a copy of Mad magazine while contemplating life the other day, I quietly exclaimed, "Hmmmmm, I wonder why we sometimes have floaties and sometimes not." Fortunately, the guy in the next stall just thought I was talking on my cell phone.
-- Paul N Destall
Well, Paul, if the guy N D next stall was, say, Archimedes or a physics professor, he probably could have answered your question. Things float when they weigh less than the water they displace. Floaties are full of bubbles of intestinal gas, probably because the digested food was relatively high in fiber, but not necessarily. Sinkers are more compacted, denser. A protein meal? There. One less thing for you to contemplate. Get back to work.