Deep and involved discussion about the ethics of organ transplantation, research into growing new organs, cloning etc. and why haven’t we evolved with spare organs in our bodies just in case? I point out that we do have one spare organ – we have 2 kidneys and only really need one. Junior Daughter “oh yes, like we have 2 nostrils!” Senior Daughter “and bum cheeks!” Well if you need a nostril or a bum cheek transplant, you know where to go.