How "Old" Are The Atoms In Our Body? Richard Feynman once said, "So what is this mind of ours: what are these atoms with consciousness? Last week’s potatoes! They now can remember what was going on in my mind a year ago — a mind which has long ago been replaced. To note that the thing I call my individuality is only a pattern or dance, that is what it means when one discovers how long it takes for the atoms of my brain to be replaced by other atoms." He's apparently referring to a research which concluded from radio isotope tracings of chemicals entering and leaving the body that we replace around 98% of our bodies’ atoms every year or so. Can anyone show me to an article or discussion on this topic? I find immensely interesting the fact that the matter which forms us is constantly being renewed and would like to look into this with more detail.