diff --git a/talks-public/2020-03-24-ensea/2020-03-24-ensea.org b/talks-public/2020-03-24-ensea/2020-03-24-ensea.org
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+++ b/talks-public/2020-03-24-ensea/2020-03-24-ensea.org
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+#+COLUMNS: %40ITEM %10BEAMER_env(Env) %9BEAMER_envargs(Env Args) %10BEAMER_act(Act) %4BEAMER_col(Col) %10BEAMER_extra(Extra) %8BEAMER_opt(Opt)
+#+TITLE: Software Heritage
+#+SUBTITLE: Analyzing the Global Graph of Public Software Development
+#+BEAMER_HEADER: \date[24 Mar 2020, ENSEA]{24 Mars 2020\\ENSEA --- Cergy, France\\ (via conf call)\\[-2ex]}
+#+AUTHOR: Stefano Zacchiroli
+#+DATE: 24 March 2020
+#+EMAIL: zack@upsilon.cc
+
+#+INCLUDE: "../../common/modules/prelude-toc.org" :minlevel 1
+#+INCLUDE: "../../common/modules/169.org"
+#+BEAMER_HEADER: \institute[UParis \& Inria]{Université de Paris \& Inria --- {\tt zack@upsilon.cc, @zacchiro}}
+#+BEAMER_HEADER: \author{Stefano Zacchiroli}
+
+# Required by graph-compression.org module
+#+LATEX_HEADER_EXTRA: \usepackage{pdfpages}
+
+# Syntax highlighting setup
+#+LATEX_HEADER_EXTRA: \usepackage{minted}
+#+LaTeX_HEADER_EXTRA: \usemintedstyle{tango}
+#+LaTeX_HEADER_EXTRA: \newminted{sql}{fontsize=\scriptsize}
+#+name: setup-minted
+#+begin_src emacs-lisp :exports results :results silent
+   (setq org-latex-listings 'minted)
+   (setq org-latex-minted-options
+         '(("fontsize" "\\scriptsize")
+           ("linenos" "")))
+   (setq org-latex-to-pdf-process
+         '("pdflatex -shell-escape -interaction nonstopmode -output-directory %o %f"
+           "pdflatex -shell-escape -interaction nonstopmode -output-directory %o %f"
+           "pdflatex -shell-escape -interaction nonstopmode -output-directory %o %f"))
+#+end_src
+# End syntax highlighting setup
+
+* About me                                                  :B_ignoreheading:
+  :PROPERTIES:
+  :BEAMER_env: ignoreheading
+  :END:
+  #+INCLUDE: "this/zack.org" :minlevel 2
+* Software Heritage
+** Software Heritage in a nutshell \hfill www.softwareheritage.org
+#+BEAMER: \transdissolve
+#+INCLUDE: "../../common/modules/swh-goals-oneslide-vertical.org::#goals" :only-contents t :minlevel 3
+** An international, non profit initiative\hfill built for the long term
+  :PROPERTIES:
+  :CUSTOM_ID: support
+  :END:
+*** Sharing the vision                                              :B_block:
+  :PROPERTIES:
+  :CUSTOM_ID: endorsement
+  :BEAMER_COL: .5
+  :BEAMER_env: block
+  :END:
+   #+LATEX: \begin{center}{\includegraphics[width=\extblockscale{.4\linewidth}]{unesco_logo_en_285}}\end{center}
+   #+LATEX: \vspace{-0.8cm}
+   #+LATEX: \begin{center}\vskip 1em \includegraphics[width=\extblockscale{1.4\linewidth}]{support.pdf}\end{center}
+   #+latex:\mbox{}~~~~~~~\tiny\url{www.softwareheritage.org/support/testimonials}
+*** Donors, members, sponsors                                       :B_block:
+    :PROPERTIES:
+    :CUSTOM_ID: sponsors
+    :BEAMER_COL: .5
+    :BEAMER_env: block
+    :END:
+   #+LATEX: \begin{center}\includegraphics[width=\extblockscale{.4\linewidth}]{inria-logo-new}\end{center}
+   #+LATEX: \begin{center}
+   #+LATEX: \colorbox{white}{\includegraphics[width=\extblockscale{1.4\linewidth}]{sponsors.pdf}}
+   #+latex:\mbox{}~~~~~~~\tiny\url{www.softwareheritage.org/support/sponsors}
+   #+LATEX: \end{center}
+** Status                                                   :B_ignoreheading:
+   :PROPERTIES:
+   :BEAMER_env: ignoreheading
+   :END:
+#+INCLUDE: "../../common/modules/status-extended.org::#archivinggoals" :minlevel 2
+#+INCLUDE: "../../common/modules/status-extended.org::#architecture" :minlevel 2 :only-contents t
+#+INCLUDE: "../../common/modules/status-extended.org::#merkletree" :minlevel 2
+#+INCLUDE: "../../common/modules/status-extended.org::#datamodel" :only-contents t
+#+INCLUDE: "../../common/modules/status-extended.org::#dagdetailsmall" :only-contents t
+#+INCLUDE: "../../common/modules/status-extended.org::#archive" :minlevel 2
+* Querying the archive
+** Exploitation
+   #+BEAMER: \LARGE \centering
+   How do you query the Software Heritage archive?
+   #+BEAMER: \Large \\
+   (on a budget)
+
+** Use cases --- product needs
+   e.g., for https://archive.softwareheritage.org
+*** Browsing
+    - =ls=
+    - =git log= (Linux kernel: 800K+ commits)
+*** Wayback machine
+    - tarball
+    - =git bundle= (Linux kernel: 7M+ nodes)
+*** Provenance tracking
+    - commit provenance (one/all contexts)
+      - requires backtracking
+    - origin provenance (one/all contexts)
+*** Note
+    We therefore need both the Merkle DAG graph and its *transposed*
+
+** Use cases --- research questions
+*** For the sake of it
+    - local graph topology
+    - connected component size
+      - enabling question to identify the best approach (e.g., scale-up
+        v. scale-out) to conduct large-scale analyses
+    - any other emerging property
+*** Software Engineering topics
+    - software provenance analysis at this scale is pretty much unexplored yet
+    - industry frontier: increase granularity down to the individual line of
+      code
+    - replicate at this scale (famous) studies that have generally been
+      conducted on (much) smaller version control system samples to
+      confirm/refute their findings
+    - ...
+
+ #+INCLUDE: "../../common/modules/dataset.org::#main" :minlevel 2 :only-contents t
+ #+INCLUDE: "../../common/modules/dataset.org::#morequery" :minlevel 2 :only-contents t
+
+** Discussion
+   - one /can/ query such a corpus SQL-style
+   - but relational representation shows its limits at this scale
+   - ...at least as deployed on commercial SQL offerings such as Athena
+   - note: (naive) sharding is ineffective, due to the pseudo-random
+     distribution of node identifiers
+   - experiments with Google BigQuery are ongoing
+     - (we broke it at the first import attempt..., due to very large arrays in
+       directory entry tables)
+
+* Graph compression
+ #+INCLUDE: "../../common/modules/graph-compression.org::#main" :minlevel 2 :only-contents t
+
+* Conclusion
+  #+INCLUDE: "this/roadmap.org" :minlevel 2
+** Wrapping up
+  #+latex: \vspace{-2mm}
+*** 
+    - Software Heritage archives all public source code as a huge Merkle DAG
+    - Querying and analyzing it at scale (20/300 B nodes/edges) is an open
+      problem
+    - Gold mine of research leads in sw. eng., complex networks, big code,
+      reproducibility
+  #+latex: \vspace{-2mm}
+*** References
+  #+latex: \vspace{-1mm}
+  #+BEGIN_EXPORT latex
+  \begin{thebibliography}{}
+  \scriptsize
+
+  \bibitem{Abramatic2018} Jean-François Abramatic, Roberto Di Cosmo, Stefano Zacchiroli
+  \newblock Building the Universal Archive of Source Code
+  \newblock Communications of the ACM, October 2018
+
+  \bibitem{Pietri2019} Antoine Pietri, Diomidis Spinellis, Stefano Zacchiroli
+  \newblock The Software Heritage graph dataset: public software development under one roof
+  \newblock MSR 2019: 16th Intl. Conf. on Mining Software Repositories. IEEE
+
+  \bibitem{Boldi2020} Paolo Boldi, Antoine Pietri, Sebastiano Vigna, Stefano Zacchiroli
+  \newblock Ultra-Large-Scale Repository Analysis via Graph Compression
+  \newblock SANER 2020, 27th Intl. Conf. on Software Analysis, Evolution and Reengineering. IEEE
+
+  \end{thebibliography}
+  #+END_EXPORT
+*** Contacts
+    Stefano Zacchiroli / zack@upsilon.cc / @zacchiro
+
+* Appendix                                                       :B_appendix:
+  :PROPERTIES:
+  :BEAMER_env: appendix
+  :END:
diff --git a/talks-public/2020-03-24-ensea/Makefile b/talks-public/2020-03-24-ensea/Makefile
new file mode 100644
index 0000000..68fbee7
--- /dev/null
+++ b/talks-public/2020-03-24-ensea/Makefile
@@ -0,0 +1 @@
+include ../Makefile.slides
diff --git a/talks-public/2020-03-24-ensea/this/roadmap.org b/talks-public/2020-03-24-ensea/this/roadmap.org
new file mode 100644
index 0000000..f4e1bad
--- /dev/null
+++ b/talks-public/2020-03-24-ensea/this/roadmap.org
@@ -0,0 +1,2 @@
+** Research roadmap (in brief)
+   TODO
diff --git a/talks-public/2020-03-24-ensea/this/zack.org b/talks-public/2020-03-24-ensea/this/zack.org
new file mode 100644
index 0000000..df246b8
--- /dev/null
+++ b/talks-public/2020-03-24-ensea/this/zack.org
@@ -0,0 +1,8 @@
+
+** About me
+   - Associate Professor (/Maître de conférences/), Université de Paris
+   - on leave (/délégation/) at Inria
+   - Free/Open Source Software activist (20+ years)
+   - Debian Developer & Former 3x Debian Project Leader
+   - Former Open Source Initiative (OSI) director
+   - Software Heritage co-founder & CTO