TomKnight>That is correct. I've personally done the experiment. On Nov 29, 2013, at 1:57 PM, Eugene Salamin wrote: A while ago we had a discussion about whether heavy ice floats or sinks in light water. It sinks. I found a picture and tried to post it, but it exceeded the 40 KB limit for math-fun postings. It's on page 6 of this document. http://mragheb.com/NPRE%20402%20ME%20405%20Nuclear%20Power%20Engineering/Iso... people should don their tinfoil hat before viewing. -- Gene Now if you titrate to neutral buoyancy, you'd almost have something practical. I just learned that the whole reason to brominate vegetable oils is to raise their specific gravity so they don't separate from aqueous solution. (So you probably need to tweak for salt or sugar content.) A more direct (and costly?) approach might be simply to deuterate the (citrus or whatever) oil. The catch is that the D will wander around replacing your H. So what? Apparently this can derange the relative efficiencies of various enzymes, leading to chemical imbalances. Some cells (and some organisms) are better than others at adjusting the enzyme concentrations to compensate. (This from a long ago talk I attended.) --rwg The .0156% natural abundance suggests that the effects of dietary deuterium deprivation would be subtle. I read somewhere that willow roots concentrate D, but now all I can find is that they concentrate heavy metals. And aspirin. (Well, actually the bark. Well, salicylic acid, of which aspirin is the precursor.)