LOL love it Jim. I can't help but jump in. Love physics and math riddles (sometimes) Just to keep it rolling. My boat floats higher in the fresh water river, but sinks a bit when I hit the Gulf. Quiz: What is the Displacement weight in the river? ***SAME Volume of the water displaced changes because of specific gravity change, Weight of the water displaced is still the same (ignoring diesel spent, and beers pissed overboard)*** Quiz: When I stand on my electronic bathroom scale and then lean over about 20° angle, did I lose weight? This one is really tricky. ***what are you leaning ON to get to 20degrees Jim? That is where your weight was distributed to instead of the scale cells*** Quiz: If a truck full of sand pulls up on a public scale and it reads 43,100 lbs, a small pick up pulls up and 2 guys get out and shovels 4 more shovels of sand on the big truck. New reading 43,000 lbs. Did the truck steal some sand? ***Good puzzle, I imagine the truck is not fully on the scale, and they shoveled sand outside of the off-scale axle. Changing weight distribution, removing weight from the on-scale axle.**** Go for it!