diff --git a/2025-03-23.md b/2025-03-23.md
index 9a4846d11..918439210 100644
--- a/2025-03-23.md
+++ b/2025-03-23.md
@@ -6,6 +6,7 @@
     - Then I started an [[Introduction to Systems Thinking]] by [[Donella Meadows]] called [[Thinking in Systems]].
 - Yesterday I thought again quite a bit about:
   - [[light]]
+    - led me to read [[photon]] in Wikipedia, very nice article!
   - [[momentum]]
   - [[entropy]]
   - Quiz: what do momentum and entropy have in common?
diff --git a/photons.md b/photons.md
new file mode 100644
index 000000000..5f94f6ced
--- /dev/null
+++ b/photons.md
@@ -0,0 +1 @@
+- #pull [[photon]]