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so there is a big word on there stull steganoggraphy. it is kind of a companion to cryptoggraphy. well stegangraphy is about writing. so that is by way of definition there. i will go back to a few slides. as a historian some of the questions i ask is did it change the course of history? sometimes it did. was it a child's toy or serious business? it is serious business but it is fun. the book is a lot broader than secret ink or invisible ink. it is really its impact on history and secret communication in general. it is elumeinating to help understand the thinking because it is the same understanding for what the nsa does when it incepts e-mail. i look at these two as big brother and little sister. cryptography has gotten of l of the attention. here is your handout and one has famous practitioners and you can take them home. george washington and mary queen of scott and i will tell you more as we go along. and invisible ink -- only a small part is about ink so i will not go into technical treatise about ink. don't worry. but there are lemon juice, milk, bodily fluids like saliva and

and so i thought, well, that actually -- i see mark shaking his head -- that stull lactuall sounded prettyolice, this was an accident, didn't know the gun was loaded. we heard on the second day of testimony that he was inside of his home, instead of just remaining inside of his home, he actually opens up the front door, shoots her in the face with the shotgun, through the screen door. if those indeed are the facts of this case, then i say he is certainly, certainly not -- he was not acting in self-defense. and i think the prosecution has a very, very strong case of murder here. >> mark, jump in. how does the defense make the case he was threatened? he was inside his home. >> well, that's exactly it. he was inside of his home. we have something called the castle doctrine which is if you're in your home, it is your castle, you can protect it. frankly i think the prosecution's got a tough road to go on this. because most people are going to say if i'm in my house, somebody is on my porch, they're banging, they have got no reason to be there, it is reasonable that i'm going to be able to defen