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+\begin{frame}
+
+    \titlepage
+    \centering
+
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{This really happened...}
+ 
+    \vspace{5mm}
+  \uncover<2->{Distributed version control using email, USB keys and CD-ROMS} 
+\end{block}
+
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+You developed some code and published an article
+ \end{block}
+
+\end{frame}
+
+
+
+\begin{frame}
+  \begin{block}{}
+Now you've been invited to give a presentation
+ \end{block}
+
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+Presentations need pictures
+ \end{block}
+
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+Re-run the analysis to get the images
+ \end{block}
+
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+The image in the article looked like
+ \end{block}
+
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{}
+    \includegraphics[width=\columnwidth]{images/good}
+  \end{block}
+
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+With the same data it now looks like
+ \end{block}
+
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+ \includegraphics[width=\columnwidth]{images/notgood}
+ \end{block}
+
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{}
+ 
+\textit{This is less than ideal...}
+ \end{block}
+
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{Either:}
+  \vspace{5mm}
+  \uncover<2->{The article is wrong and should be withdrawn}\\
+  \vspace{5mm}
+  \uncover<3->{Since publication you have added a bug in the code}\\
+  \end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{How can we know?}
+  \vspace{5mm}
+  \uncover<2->{Version control to the rescue!}\\
+  \vspace{5mm}
+  \uncover<3->{The version used for the article was tagged as version 1.1}\\
+  \end{block}
+\end{frame}
+
+
+
+\begin{frame}
+  \begin{block}{}
+\textit{git checkout version 1.1}\\
+ \vspace{5mm}
+ \uncover<2->{\textit{and relax}}
+ \end{block}
+ \end{frame}
+
+\begin{frame}
+  \begin{block}{Tags}
+   \vspace{5mm}
+\uncover<2->{This point in history is important enough to give it a special name}
+ \end{block}
+
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+        \vspace{5mm}
+\tiny
+\tt
+  \uncover<1->{git tag -a v1.1 -m "As used to publish: Pumpkins for Biofuels, Smith et al. 2017"}\\
+\vspace{5mm}
+  \uncover<2->{git tag -a v1.2 -m "As used to publish: Turnips as a viable Pumpkin substitute? Smith et al. 2018"}\\
+
+\end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{}
+Next time add unit tests
+ \end{block}
+
+\end{frame}
+
+
+
+
+\begin{frame}
+  \begin{block}{Repositories?}
+  \vspace{2mm}
+  \uncover<2->{gitlab}\\
+    \vspace{2mm}
+  \uncover<3->{github}\\
+  \vspace{2mm}
+  \uncover<4->{c4science}\\
+  \vspace{2mm}
+  \uncover<5->{bitbucket}\\
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+\textit{Is it a bird? Is it a plane?}
+ \end{block}
+
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{}
+\textit{Is it a VCS in the cloud?}
+ \end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{Repositories for VCS}
+   \vspace{5mm}
+  \uncover<2->{Version control is good}\\
+    \vspace{5mm}
+  \uncover<3->{Running a VCS server is less good}\\
+  \vspace{5mm}
+  \uncover<4->{Use a dedicated service!}\\
+ \end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{Repositories for Collaboration}
+    \vspace{5mm}
+  \uncover<2->{Now things get interesting}
+  \end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{}
+  \uncover<2->{1. Download code with FTP}\\
+    \vspace{2mm}
+  \uncover<3->{2. Edit code and create a patch}\\
+  \vspace{2mm}
+  \uncover<4->{3. Send patch to a mailing list}\\
+  \vspace{2mm}
+  \uncover<5->{4. Await responses from the list}\\
+   \vspace{2mm}
+  \uncover<6->{5. The maintainer adds the patch}\\
+     \vspace{2mm}
+  \uncover<7->{6. GOTO 1}\\
+  \end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{Repositories for Collaboration}
+    \vspace{5mm}
+  \uncover<2->{A shared workspace for collaborative development}\\
+      \vspace{5mm}
+  \uncover<3->{Much more than a VCS}
+
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+A social network for coders?
+ \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{Repositories are now normal}
+    \vspace{5mm}
+  \uncover<2->{At a conference we suggest an improvement}\\
+      \vspace{5mm}
+  \uncover<3->{\textit{Make a pull request!}}
+
+ \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{Altruistic coding?}
+    \vspace{5mm}
+  \uncover<2->{Anybody can improve or fix things}\\
+
+  \end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{}
+Need a new feature?
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+Found a useful tool?
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{Eigen}
+    \vspace{5mm}
+  \uncover<2->{If you use C++ and matrices you probably want Eigen}\\
+    \vspace{5mm}
+  \uncover<3->{Initially one academic developer}\\
+    \vspace{5mm}
+  \uncover<4->{Then a second came along}\\
+      \vspace{5mm}
+  \uncover<5->{Now 2 core developers and 150+ contributors}\\
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+Look at the commit history
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+Intital commit
+
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+        \vspace{5mm}
+\tiny
+\tt
+commit 3036eeca0abfee39d2a0feab4ae3ff1d28975999\\
+Author: Benoit Jacob <jacob.benoit.1@gmail.com>\\
+Date:   Wed May 30 06:24:51 2007 +0000\\
+ \vspace{5mm}
+Starting Eigen 2 development. The current plan is to use\\ the last
+release of tvmet (inactive for 2 years \\and developer unreachable) as the
+ basis for eigen2, because it provides seemingly good expression template
+ mechanisms, we want that, and it would take years to reinvent that
+ wheel.\\ We'll see. So this commit imports the last tvmet release.
+\normalsize
+\end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+4th commit
+
+  \end{block}
+\end{frame}
+
+
+
+\begin{frame}
+  \begin{block}{}
+        \vspace{5mm}
+\tiny
+\tt
+commit 7947ae0e502d4a71b5db19e582399a17d5647273\\
+Author: Benoit Jacob <jacob.benoit.1@gmail.com>\\
+Date:   Wed May 30 12:14:09 2007 +0000\\
+ \vspace{5mm}
+    A TODO to motivate hundreds of hackers to help \\ with Eigen 2 development.\\
+    \vspace{2mm}
+    Cheesy slashdot joke included.\\
+\normalsize
+\end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+Repositories don't have to be open to everybody
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+    \vspace{5mm}
+  \uncover<1->{Write code and publish a paper }\\
+    \vspace{5mm}
+  \uncover<2->{Keep developing the code for the next article}\\
+    \vspace{5mm}
+  \uncover<3->{What do you want to make public?}\\
+      \vspace{5mm}
+  \end{block}
+\end{frame}
+
+
+
+% Technical and political aspects
+
+
+\begin{frame}
+  \begin{block}{}
+The commit history shows how your code developed
+  \end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{}
+        \vspace{5mm}
+\tiny
+\tt
+commit 1234567890abcdefghijklmnopqrstuvwxyz\\
+Author: Bob Smith <robert.smith@ethl.ch>\\
+Date:   Wed May 13 17:11:09 2018 +0000\\
+ \vspace{5mm}
+   Fix the scaling algorithm - it's been wrong \\ since the beginning but
+    amazingly no-one\\ has noticed until now.\\
+    \normalsize
+\end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+        \vspace{5mm}
+\tiny
+\tt
+commit 0234567890abcdefghijklmnopqrstuvwxyz\\
+Author: Bob Smith <robert.smith@ethl.ch>\\
+Date:   Wed May 28 09:32:09 2018 +0000\\
+ \vspace{5mm}
+   Initial release of the BioCode package by the \\ Smith lab at the 
+    ETH Lausanne. \\www.ethl.ch/smithlab
+       \normalsize
+\end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{External contributions?}
+  \vspace{5mm}
+   \uncover<2->{Once open it's difficult to rewrite history}\\
+ \vspace{5mm}
+ \uncover<3->{The commit is the acknowledgement!}
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{Public and private?}
+  \vspace{5mm}
+   \uncover<2->{One repository for the public}\\
+ \vspace{5mm}
+ \uncover<3->{Another for private development}\\
+ \vspace{5mm}
+ \uncover<4->{This looks like gitflow}
+  \end{block}
+\end{frame}
+
+% Example here
+
+
+
+\begin{frame}
+  \begin{block}{Recent history}
+  \vspace{5mm}
+   \uncover<2->{Google code}\\
+ \vspace{5mm}
+ \uncover<3->{Sourceforge}
+  \end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{}
+Google code is no more\\  
+\vspace{5mm}
+\tiny
+\tt
+Google Code was launched in 2006, with the goal of making it easier to collaborate with others on open-source software. 
+It offered Subversion, Mercurial, and Git source code hosting. It soon expanded to offer wikis, downloads, and even issue tracking.\\
+\vspace{2mm}
+But alas, in 2015 Google bid farewell to the service, which had since been eclipsed by other, richer open-source project hosting providers.\\
+
+\normalsize
+\end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+Sourceforge: from poster-boy to pariah in one easy takeover.\\
+  \vspace{5mm}
+   \uncover<2->{1999-2012: The place to be seen}\\
+ \vspace{5mm}
+ \uncover<3->{2012-20??: The place to avoid}
+\end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{Near future}
+  \vspace{5mm}
+   \uncover<2->{Microsoft}\\
+ \vspace{5mm}
+ \uncover<3->{LinkedIn}\\
+ \vspace{5mm}
+ \uncover<4->{GitHub}\\
+
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+  \uncover<1->{The terms and conditions for free services can and will change.}\\
+    \vspace{5mm}
+   \uncover<2->{You are the product}\\
+
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{Don't get trapped}
+ \vspace{5mm}
+\uncover<1->{ c4science/gitlab/other and mirror to github?}
+   \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{Eigen}
+ \vspace{5mm}
+\uncover<1->{Bitbucket and Github}\\
+ \vspace{5mm}
+ \small
+\uncover<2->{bitbucket.org/eigen/eigen}\\
+ \vspace{2mm}
+\uncover<2->{github.com/eigenteam/eigen-git-mirror}\\
+\normalsize
+
+   \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{Quantum Espresso}
+ \vspace{5mm}
+\uncover<1->{Gitlab and Github}\\
+ \vspace{5mm}
+ \small
+\uncover<2->{gitlab.com/QEF/q-e}\\
+ \vspace{2mm}
+\uncover<2->{github.com/QEF/q-e}\\
+\normalsize
+
+   \end{block}
+\end{frame}
+
+
+
+\begin{frame}
+  \begin{block}{Repositories are not}
+  \vspace{5mm}
+ \uncover<2->{data stores}\\
+    \vspace{5mm}
+   \uncover<3->{libraries}\\
+    \vspace{5mm}
+   \uncover<4->{archives}\\
+  \end{block}
+\end{frame}
+
+
+
+\begin{frame}
+  \begin{block}{}
+ Can we reference a tag from a repository?
+   \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+  \tiny
+\textit{In order to estimate the turnip supply needed to replace pumpkins for traditional biofuel applications we use the BioCode package (2)}\\
+
+\textit{[2] BioCode v0.3 www.c4science.ch/BioCode/source/tags/v0.3}
+\normalsize
+   \end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{}
+  \tiny
+\textit{Einstein, A.  \\
+ \vspace{5mm}
+\"{U}ber einen die Erzeugung und Verwandlung des Lichtes betreffenden heuristischen Gesichtspunkt\\
+ \vspace{5mm}
+Zentralbibliothek Z\"{u}rich}
+\normalsize
+   \end{block}
+\end{frame}
+
+
+\begin{frame}
+  \begin{block}{}
+  \tiny
+\textit{Einstein, A.  \\
+ \vspace{5mm}
+\"{U}ber einen die Erzeugung und Verwandlung des Lichtes betreffenden heuristischen Gesichtspunkt (\emph{1905})\\
+ \vspace{5mm}
+Annalen der Physik 322 s.132-148 }
+\normalsize
+   \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{}
+ \uncover<1->{Author}\\
+    \vspace{2mm}
+   \uncover<2->{Title}\\
+    \vspace{2mm}
+   \uncover<3->{Date}\\
+    \vspace{2mm}
+   \uncover<4->{Journal}\\
+       \vspace{2mm}
+   \uncover<5->{Volume}\\
+    \vspace{2mm}
+   \uncover<6->{Pages}\\
+  \end{block}
+\end{frame}
+
+\begin{frame}
+  \begin{block}{What can we do?}
+   \vspace{5mm}
+  \uncover<2->{Digital Object Identifier (DOI)}\\
+    \vspace{5mm}
+   \uncover<3->{JOSS}\\
+    \vspace{5mm}
+   \uncover<4->{Zenodo}\\
+       \vspace{5mm}
+\uncover<5->{Digital Archives?}\\
+       \vspace{5mm}
+   \end{block}
+\end{frame}
+
+% THE END
+
+\begin{frame}
+\end{frame}
+
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+\documentclass[20pt, xcolor={usenames,dvipsnames}]{beamer}
+
+\usepackage{alltt}
+
+\usepackage{color}
+\usepackage{graphicx}
+\usepackage[utf8]{inputenc}
+
+\hypersetup{
+  pdftitle={Version control and collaborative research},
+  pdfauthor={SCITAS},
+  colorlinks=true,
+  urlcolor=darkgray
+}
+
+\beamertemplatenavigationsymbolsempty
+
+\setbeamercolor{title}{fg=black}
+\setbeamercolor{author}{fg=darkgray}
+
+\title{Version control and collaborative research}
+
+\author{SCITAS}
+
+
+\institute{\'{E}cole Polytechnique F\'{e}d\'{e}rale de Lausanne}
+\date{} 
+
+
+\defbeamertemplate{itemize item}{hollow circle}{$\circ$}
+\setbeamertemplate{itemize item}[hollow circle]
+\setbeamercolor{itemize item}{fg=gray}
+
+\setbeamercolor{structure}{fg=darkgray} % itemize, enumerate, etc
+
+
+\begin{document}
+\input{document}
+\end{document}
+
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