&gt;It’s also debatable if cell totals is a useful metric. After all, Milo&#x27;s calculations show that 90 percent of human cells are red blood cells, which don&#x27;t contain DNA and aren’t capable of dividing. They’re rather poor excuses for cells—remove them from the equation and the 10:1 ratio reinstates itself.<p>So all that and it says the ratio might be perfectly correct when you only count proper cells.  Great.<p>I want to hear where the 724 trillion number came from.