and we're back with professor paul turner president microbiology and ecology at yale university paul iraq back to sorry parapet searching sorry for it he meant our president a virus of generations and generations ago so our game to remember is how to fight certain factions and then we as faces grow more resistant over time and then it got me thinking how come some people go through jihad and their kids go through chicken pox is left. so this is the interesting thing about interactions between humans and certain passages so you said many things that are very intriguing in your statement one is that you see and genomes the ghosts of infection so in the long long ago evolution of our predecessors on this planet if they were interacting with viruses and being infected enough those viruses got it once all the germline so if they are asked for generation to generation through gametes then they become part of our genome and that's what we can recognise really when you do human genome sequence it interesting recent listenings there was a lot of then a social good so part of it for example these t