by Christoph — One of the most con­vinc­ing ar­guments for a com­mon ori­gin of all known life forms on this pla­net is that they all use the same ge­net­ic code. In my un­der­stand­ing, the ar­gu­ment is strength­en­ed, per­haps some­what coun­ter‑­in­tuiti­ve­ly, by the nu­mer­ous find­ings that and how ma­ny life forms mo­di­fy the ca­no­ni­cal ge­net­ic code in ways that suit them...