\documentclass[hyperref=pdftex, presentation]{beamer}
% Replacing 'presentation' with 'handout' in the above line
% will produce 4 slides per page.
% The hyperref option makes it possible to include hyperlinks.

\mode<presentation> {
\usetheme{Boadilla}
\setbeamercovered{transparent}
}

\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{times}
\usepackage[T1]{fontenc}

\mode<handout>{
\usepackage{pgfpages}
\pgfpagesuselayout{4 on 1}[letterpaper,landscape,border shrink=5mm]
\setbeamercolor{background canvas}{bg=black!10} }

\setbeamertemplate{footline}
{
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{author
	in head/foot}%
	\usebeamerfont{author in head/ foot}\insertshortauthor%&\approx& (\insertshorti
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{title
	in head/foot}%
	\usebeamerfont{title in head/foot}\insertshorttitle
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in
	head/foot}%
	\usebeamerfont{date in head/foot}\insertshortdate\hspace*{2em}
	\insertframenumber / \inserttotalframenumber\hspace*{2ex}
\end{beamercolorbox}}%
\vskip0pt%
}

\titlegraphic{\includegraphics[height=.5\textheight]{Lesson1958}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\title{Home coffee roasting}
	%\titlegraphic{\includegraphics[width=0.3\textwidth]{coffee_cup_1}}
	%\titlegraphic{\includegraphics[height=0.4\textheight]{coffee_cup_1}}
	%\subtitle{Is a ``fun'' talk in Beamer possible?}

\author{Sho Uemura}
%\institute{SLAC}
\date[February 12, 2014]

\begin{document}

\begin{frame}
	\titlepage
\end{frame}

%\begin{frame}{Abstract}
%
%Mechanical puzzles are intuitive, fun, and exist in wide variety. 
%Some puzzles test your spatial reasoning.
%Some puzzles test your intuition and imagination. 
%Some puzzles test your patience.
%Some puzzles are impossible, and some are even undecidable.
%A talk about toys where you don't get to play with toys! This will be terrible.
%\end{frame}

\begin{frame}{Where does coffee come from?}
	\begin{itemize}
		\item Coffee ``beans'' are seeds
		\item Grown around the world: Central and South America, Middle East, Africa, SE Asia, Australia, islands
		\item Harvested as ripe berries, 1 or 2 beans/berry
		\item Some combination of milling, fermentation, drying to remove the flesh and make green coffee
		\item Taste depends on altitude, climate, varietal, processing
	\end{itemize}
	\begin{centering}
		\includegraphics[width=0.4\textwidth]{coffeecherry}
		\hspace{0.1\textwidth}
		\includegraphics[width=0.175\textwidth]{11}
		\hspace{0.1\textwidth}
		\includegraphics[width=0.175\textwidth]{pulping}
	\end{centering}
\end{frame}

\begin{frame}{Why do we roast?}
	\begin{itemize}
		\item Water evaporates
		\item Sugars caramelize: lose sweetness, gain flavor
		\item Bitter chemicals (trigonelline) decompose to aromatics
		\item Acids evaporate or decompose
		\item Caffeine and oils mostly unaffected
	\end{itemize}
\end{frame}

\begin{frame}{Why should I roast?}
	\begin{columns}
		\column{0.5\textwidth}
		\begin{itemize}
			\item Roasted coffee goes stale in a couple of weeks; green coffee keeps for months
				\begin{itemize}
					\item Volatile aromatics evaporate
					\item Oils migrate to surface and go rancid
					\item Ground coffee has basically no shelf life --- grind your own, even if you don't roast
				\end{itemize}
			\item Green coffee is cheap (today's Kenya AB: \$6.55/lb from sweetmarias.com)
			\item More variety in green coffee and in your roasts
			\item Roast to your own taste and brewing method
		\end{itemize}
		\column{0.5\textwidth}
		\includegraphics[width=\textwidth]{bonappetit}
	\end{columns}
\end{frame}

\begin{frame}{What if I don't want to roast?}
	\begin{itemize}
		\item Buy roasted coffee locally
			\begin{itemize}
				\item Get beans at a place where you like the coffee
				\item Around here: Moksha (supplies ZombieRunner), Dana Street Roasting Company
			\end{itemize}
		\item Be careful with blends
			\begin{itemize}
				\item Big producers use blending for consistency, not quality
				\item If it tastes the same every time, it probably doesn't taste very good
			\end{itemize}
		\item Grind your own --- mills are cheap
	\end{itemize}
\end{frame}

\begin{frame}{How?}
	\begin{columns}
		\column{0.7\textwidth}
		\begin{itemize}
			\item Need to get beans up to 200+ $^\circ$C gradually and uniformly
				\begin{itemize}
					\item Heating: convection or conduction
					\item Mixing: air or mechanical
				\end{itemize}
			\item Free: oven, wok
				\begin{itemize}
					\item Scorching, overroasting
				\end{itemize}
			\item Cheap: popcorn popper
				\begin{itemize}
					\item Not designed for this temperature or mass
				\end{itemize}
			\item Home roasters: air roasters, drum roasters
				\begin{itemize}
					\item Capacity, speed, control, smoke, noise $\dots$
				\end{itemize}
		\end{itemize}
		\column{0.3\textwidth}
		\includegraphics[width=\textwidth]{popper}

		\includegraphics[width=0.4\textwidth]{aircrazy1}
		\includegraphics[width=0.6\textwidth]{freshroast_sr300_roasting_coffee}

		\includegraphics[width=\textwidth]{gene_cafe_1_2_1}
	\end{columns}
\end{frame}

\begin{frame}{Roast levels}
	\begin{columns}
		\column{0.6\textwidth}
		\begin{itemize}
			\item Two audible ``cracks'' mark roast stages
			\item First crack ($\sim$205 $^\circ$C): sucrose decomposes
				\begin{itemize}
					\item Beans puff up visibly
					\item Color goes from mottled brown to uniform
				\end{itemize}
			\item Roasts between 1st and 2nd crack (City, Full City) have most coffee flavor
			\item Second crack ($\sim$225 $^\circ$C): ``cellular matrix'' decomposes
				\begin{itemize}
					\item Oily sheen, chipping
				\end{itemize}
			\item Roasts during/after 2nd crack (Vienna, French) emphasize roast flavor over coffee flavor
		\end{itemize}
		\column{0.4\textwidth}
		\includegraphics[width=0.3\textwidth]{7}
		\includegraphics[width=0.3\textwidth]{26}
		\includegraphics[width=0.3\textwidth]{28}

		\includegraphics[width=\textwidth]{Darkroastcrosssection}
	\end{columns}
\end{frame}

\end{document}

