diff --git a/presentation/images/charged_and_neutral_neutrino_interactions.pdf b/presentation/images/charged_and_neutral_neutrino_interactions.pdf
deleted file mode 100644
index 3c03909..0000000
Binary files a/presentation/images/charged_and_neutral_neutrino_interactions.pdf and /dev/null differ
diff --git a/presentation/presentation.tex b/presentation/presentation.tex
index 42fb903..bff78f7 100644
--- a/presentation/presentation.tex
+++ b/presentation/presentation.tex
@@ -2,8 +2,9 @@
 \documentclass{beamer}
 
 \usepackage{amsmath}
+\usepackage{amssymb}
 \usepackage{tikz}
-%\usepackage[english]{babel}
+\usepackage[english]{babel}
 
 %\title{Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector}
 \title{	IceCube Neutrino Astronomy }
@@ -19,7 +20,7 @@
 
 \begin{document}
 
-\begin{frame}
+\begin{frame}[noframenumbering]
 	\titlepage
 \end{frame}
 \note{}
@@ -39,12 +40,12 @@
 %
 %
 %%%%%%%%%%%%%%%%%%%%%
-\begin{frame}{Overview}
+\begin{frame}[noframenumbering]{Overview}
 	\tableofcontents
 \end{frame}
 
 \section{ Neutrino Astronomy }
-\begin{frame}{ History of Neutrino Astronomy }
+\begin{frame}{ Neutrino Astronomy: History }
 	\begin{itemize}
 		\item First observation of neutrino in 1956
 		\item Deep Underwater Muon and Neutrino Detector, Hawaii (1990)
@@ -54,7 +55,7 @@
 	\end{itemize}
 
 \end{frame}
-\begin{frame}{ Basics of Neutrino Astronomy}
+\begin{frame}{ Neutrino Astronomy: Basics }
 			\begin{itemize}
 				\item Neutrino interacts in atmosphere, ice or water
 				\item Charged particle gets into the ice or water and emit Cherenkov photons
@@ -70,16 +71,13 @@
 				\end{column}
 			\end{columns}
 \end{frame}
-\begin{frame}{ Production of Neutrinos }
-	Many sources of neutrinos
+\begin{frame}{ Neutrino Astronomy: Production }
+	Neutrinos produced in sources and CR interactions
 	\begin{itemize}
-	\item CR interactions: 	
+	\item Main CR interactions: 	
 		\begin{itemize}
-			\item \begin{equation*} p + \gamma_{bg} \to p + \pi^0 \to p + \gamma + \gamma
-			\end{equation*}
-			\item \begin{equation*}
-p + \gamma_{bg} \to n + \pi^+ \to n + \mu^ + \nu_\mu \to n + \nu_\mu + e^ + \bar{\nu_\mu} + \nu_e
-		\end{equation*}
+			\item $ p + \gamma_{bg} \to p + \pi^0 \to p + \gamma + \gamma $
+			\item $	p + \gamma_{bg} \to n + \pi^+ \to n + \mu^ + \nu_\mu \to n + \nu_\mu + e^ + \bar{\nu_\mu} + \nu_e $
 		\end{itemize}
 	\end{itemize}
 \end{frame}
@@ -99,6 +97,9 @@ p + \gamma_{bg} \to n + \pi^+ \to n + \mu^ + \nu_\mu \to n + \nu_\mu + e^ + \bar
 	\end{itemize}
 \end{frame}
 
+\begin{frame}{IceCube observatory: Digital Optical Module}
+	\includegraphics[width=\textwidth]{images/icecube-4-Aartsen_2017_DOM.pdf}
+\end{frame}
 
 
 \subsection{Event Detection and Background}
@@ -114,14 +115,46 @@ p + \gamma_{bg} \to n + \pi^+ \to n + \mu^ + \nu_\mu \to n + \nu_\mu + e^ + \bar
 	
 \end{frame}
 \begin{frame}{Event Detection}
-	\begin{itemize}
-		\item Tracklike: distinct track
-		\item Showerlike: spherical light pattern due to well-localised particle shower 
-	\end{itemize}
+	\begin{columns}[t]
+		\begin{column}{.5\textwidth}
+			\begin{block}{Tracklike}
+				\begin{itemize}
+					\item Distinct track -- caused by $\mu^{-}$
+					\item Angular resolution $\lesssim 1\deg$
+					\item Energy resolution not so good
+				\end{itemize}
+			\end{block}
+		\end{column}
+		\begin{column}{.5\textwidth}
+			\begin{block}{Showerlike}
+				\begin{itemize}
+					\item Spherical light pattern due to well-localised particle shower
+					\item Angular resolution $\sim 15\deg$
+					\item Energy resolution $\sim 15\%$
+				\end{itemize}
+			\end{block}
+		\end{column}
+	\end{columns}
 	\includegraphics[width=\textwidth]{images/simulation_of_cherenkov_propagation.png} 
 \end{frame}
 
 \begin{frame}{Event Detection}
+	\begin{columns}[t]
+		\begin{column}{.5\textwidth}
+			\begin{block}{Tracklike}
+				\begin{itemize}
+					\item d
+				\end{itemize}
+			\end{block}
+		\end{column}
+		\begin{column}{.5\textwidth}
+			\begin{block}{Showerlike}
+				\begin{itemize}
+					\item d
+				\end{itemize}
+			\end{block}
+		\end{column}
+	\end{columns}
 
 	\begin{columns}[t]
 		\begin{column}{.5\textwidth}
@@ -144,7 +177,11 @@ p + \gamma_{bg} \to n + \pi^+ \to n + \mu^ + \nu_\mu \to n + \nu_\mu + e^ + \bar
 \end{frame}
 
 \begin{frame}{Background}
-	$10^{-6}$ events due to neutrino interaction
+	\begin{itemize}
+		\item 2500 to 2900 events per second
+		\item $\sim 10^{5}$ atmospheric neutrinos vs. $\lesssim 10^3$ cosmic neutrinos per year 
+		\item $10^{-6}$ events due to neutrino interaction
+	\end{itemize}
 \end{frame}