Too bad this series has come to an end, @honeydue. In this part I didn't know the story of Ignaz Semmelweis and Vlad the Impaler. Thank you for bringing them and making them known. I am disturbed by the story of Ignaz Semmelweis. It worries me that even today many of the cures to major diseases are deceived because there is doubt about the credibility of some scientists or because some are really not interested in finding the solution. Such a simple thing as handwashing could have saved many lives. How many solutions like this will be right under our noses and we will not be applying them out of ideological blindness or professional arrogance. Thank you for this series. It was really interesting.