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2025-03-23.md

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+- Traveling to the US today!
+  - As I write this I'm typing on my laptop on an American flight from [[Heathrow]] to [[Durham]].
+  - I've been reading and listening to audiobooks:
+    - I started [[Flowers for Algernon]] on the flight from Zürich, it's already quite moving (as expected).
+    - Then I continued [[Memories of Hadrian]].
+    - Then I started an [[Introduction to Systems Thinking]] by [[Donella Meadows]] called [[Thinking in Systems]].
+- Yesterday I thought again quite a bit about:
+  - [[light]]
+  - [[momentum]]
+  - [[entropy]]
+  - Quiz: what do momentum and entropy have in common?

Thinking in Systems.md

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+- a [[book]].
+  - by [[Donella Meadows]].
+    - It says upfront it's going to be light on math and computer references, which it's a bit of a shame, but I also like that it's written for a general audience.
+    - It's a bit old, from the eighties I believe (but then again, so am I) -- but supposedly it's held up nicely.

light.md

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 # light
 
+- (This node is old and lightly surprising even to me :))
 - a [[thing]].
   - a [[particle]] and a [[wave]]
-  - [[process]]
+- a [[process]]?
     - perhaps [[emergent]]?
-  - [[pull]] [[photons]]
+  - #pull [[photons]]
-  - [[pull]] [[fire]]
+  - #pull [[fire]]
     - it has been said before: [[come on baby light my fire]].
   - [[beams of light]] seem correlated with [[free energy]]
 
@@ -13,3 +14,7 @@ Every day I try to ask myself: where are my [[lights]]?
 
 It is a [[question]] with many interesting [[answers]].
 
+--
+
+As of [[2025-03-23]] I ran into [[Gilbert N. Lewis]]'s letter to Nature where he introduced the word [[photon]] into common usage: https://en.wikipedia.org/wiki/Photon
+