diff --git a/2021-07-12.md b/2021-07-12.md
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+- [[lisp]]
+- [[alan perlis]]
+- [[roam like]]
+- [[athens]]
+	- [[archon]]
+		- [[eponymous archon]]
+			- https://en.wikipedia.org/wiki/Eponymous_archon
+		- [[thesmotetai]]
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diff --git a/2021-07-13.md b/2021-07-13.md
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+- [[cheap calculator]]
+- [[edsger dijkstra]]
+- [[vitaly kaloyev]]
+- [[stpa]]
+	- [[stpa workshop]]
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diff --git a/alan perlis.md b/alan perlis.md
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+- a [[person]].
+	- [[computer scientist]]
+	- first recipient of the [[turing award]]
+	- [[wp]] https://en.wikipedia.org/wiki/Alan_Perlis
+	- [[push]] [[programming epigrams]] 
+		- [[go]] https://cpsc.yale.edu/epigrams-programming
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diff --git a/cheap calculator.md b/cheap calculator.md
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+- [[push]] [[casio fx 115espls2]]
+	- [[go]] https://www.amazon.com/Casio-fx-115ESPLS2-Advanced-Scientific-Calculator/dp/B086Z79HXS/
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diff --git a/edsger dijkstra.md b/edsger dijkstra.md
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+- a [[person]]
+	- [[push]] [[dijkstra]]
+	- [[computer scientist]] [[dutch]]
+	- [[pull]] [[edsger w. dijkstra]]
+	- wrote a number of [[ewds]]
+	- [[wp]] https://en.wikipedia.org/wiki/Edsger_W._Dijkstra 
+		- [[go]] [[wp]]
+	- [[conmmemoration]] https://via.hypothes.is/https://www.cs.utexas.edu/users/EWD/commemoration/EWD-commemoration-2021.pdf
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diff --git a/lisp.md b/lisp.md
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+
+- [[hn]] https://news.ycombinator.com/item?id=27805905
+
diff --git a/roam like.md b/roam like.md
index 5c6b014bf..3a2d69974 100644
--- a/roam like.md	
+++ b/roam like.md	
@@ -4,5 +4,6 @@
 	- That is, a tool that is in some way like [[roam research]], or more generically a [[note taking tool]] that supports [[wiki conventions]] and [[backlinks]].
 	- [[pull]] [[pkm]] [[roam likes]]
 	- If you use [[roam research]], it is not hard to make the jump to:
-		- [[obsidian]]
-		- [[athens research]]
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+		- [[athens research]] (open source; pretty much a clone, at least in its beginnings)
+		- [[logseq]] (open source)
+		- [[obsidian]] (not open source)
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diff --git a/stpa handbook.md b/stpa handbook.md
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+- [[go]] https://psas.scripts.mit.edu/home/get_file.php?name=STPA_handbook.pdf
+	- [[annotate]] https://via.hypothes.is/https://psas.scripts.mit.edu/home/get_file.php?name=STPA_handbook.pdf
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diff --git a/stpa workshop.md b/stpa workshop.md
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+- I'm taking part of an [[stpa]] workshop for 2w in [[july 2021]].
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diff --git a/stpa.md b/stpa.md
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+++ b/stpa.md
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+- [[pull]] [[system theoretic process analysis]]
+- [[pull]] [[stpa handbook]]
+- [[pull]] [[stpa workshop]]
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diff --git a/system theoretic process analysis.md b/system theoretic process analysis.md
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+- a [[technique]]
+	- for [[hazard analysis]]
+	- by [[nancy leveson]]
+	- [[pull]] [[stpa]]
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