--- a/slides/slides01.tex	Tue Sep 24 12:29:24 2013 +0100
+++ b/slides/slides01.tex	Mon Sep 30 23:57:44 2013 +0100
@@ -19,8 +19,11 @@
 \usetikzlibrary{shadows}
 \usetikzlibrary{positioning}
 \usetikzlibrary{calc}
+\usepackage{upquote}
+\usetikzlibrary{plotmarks}
 \usepackage{graphicx} 
-\usepackage{upquote}
+\usepackage{pgfplots}
+
 
 \definecolor{javared}{rgb}{0.6,0,0} % for strings
 \definecolor{javagreen}{rgb}{0.25,0.5,0.35} % comments
@@ -1298,40 +1301,6 @@
 \end{frame}}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\mode<presentation>{
-\begin{frame}[c]
-\frametitle{This Course is about  Satan's Computer}
-
-Ross Anderson and Roger Needham wrote:\bigskip
-
-\begin{tikzpicture}
-\draw (0,0) node[inner sep=2mm,fill=cream, ultra thick, draw=red, rounded corners=2mm] 
-{\normalsize\color{darkgray}
-\begin{minipage}{10cm}\raggedright\small
-``In effect, our task is to program a computer which gives 
-answers which are subtly and maliciously wrong at the most 
-inconvenient possible moment\ldots{} we hope that the lessons 
-learned from programming Satan's computer may be helpful 
-in tackling the more common problem of programming Murphy's.''
-\end{minipage}};
-\end{tikzpicture}\\[30mm]
-
-\only<2>{
-\begin{textblock}{11}(2,12)
-\begin{tabular}{c}
-\includegraphics[scale=0.12]{pics/ariane.jpg}\\[-2mm]
-\footnotesize Murphy's computer
-\end{tabular}
-\begin{tabular}{c}
-\includegraphics[scale=0.15]{pics/mobile.jpg}\;
-\includegraphics[scale=0.06]{pics/pinsentry.jpg}\\[-2mm]
-\footnotesize Satan's computers
-\end{tabular}
-\end{textblock}}
-
-\end{frame}}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \mode<presentation>{