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@@ -136,7 +136,7 @@ Feel free to explore, learn, and contribute by adding information, corrections,
   
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-## [Predecessors]() of Quantum Mechanics <br>
+# [Predecessors]() of Quantum Mechanics <br>
 
 ### 1. [Leonhard Euler]() (1748) <br> ────────────── 
 
@@ -258,7 +258,8 @@ Ramanujan's deep insights into infinite series and modular forms continue to inf
 
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-## [Beginning of the 20th Century]() – Foundations of Quantum Mechanics
+# [Beginning of the 20th Century]() – Foundations of Quantum Mechanics
+
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 ### 6. [Max Planck]() (1900) <br>  ──────────────