NewLimit CEO @jacobkimmel explains why making old cells young isn't the hard part: the challenge is rejuvenating them without erasing their identity "Going back about 20 years, a guy won the Nobel Prize because he showed just turning on a group of four special transcription factor genes can take any old cell and turn it back into a young stem cell version of itself." "If we did that in your body, it would actually cause cancers, so it would be more problematic than beneficial." "The trick of…