And I'll do other videos in the future on what viruses are and how they replicate and viruses actually are fascinating, because it is not actually clear that they are alive, they're literally just little buckets of DNA and sometimes RNA which we'll learn is genetic information and they're just contained in these viral... these little protein containers that are these neat geometrical shapes and that's all they are, they really don't have - you know - they are not like regular living organisms, that actively move and that actively have metabolisms and all that.