diff --git a/lectures/_toc.yml b/lectures/_toc.yml
index 524b302..97c429c 100644
--- a/lectures/_toc.yml
+++ b/lectures/_toc.yml
@@ -8,35 +8,38 @@ parts:
   - file: getting_started
   - file: python_by_example
   - file: functions
-  # - file: python_essentials
-  # - file: oop_intro
-  # - file: names
-  # - file: python_oop
-  # - file: workspace 
-# - caption: The Scientific Libraries
-#   numbered: true
-#   chapters:
-#   - file: need_for_speed
-#   - file: numpy
-#   - file: matplotlib
-#   - file: scipy
-#   - file: pandas
-#   - file: pandas_panel
-#   - file: sympy
-# - caption: High Performance Computing
-#   numbered: true
-#   chapters:
-#   - file: numba
-#   - file: parallelization
-#   - file: jax_intro
-# - caption: Advanced Python Programming
-#   numbered: true
-#   chapters:
-#   - file: writing_good_code
-#   - file: python_advanced_features
-#   - file: debugging
+  - file: python_essentials
+  - file: oop_intro
+  - file: names
+  - file: python_oop
+- caption: Foundations of Scientific Computing
+  numbered: true
+  chapters:
+  - file: need_for_speed
+  - file: numpy
+  - file: matplotlib
+  - file: scipy
+- caption: High Performance Computing
+  numbered: true
+  chapters:
+  - file: numba
+  - file: jax_intro
+  - file: numpy_vs_numba_vs_jax
+- caption: Working with Data
+  numbered: true
+  chapters:
+  - file: pandas
+  - file: pandas_panel
+- caption: More Python Programming
+  numbered: true
+  chapters:
+  - file: writing_good_code
+  - file: workspace 
+  - file: python_advanced_features
+  - file: debugging
+  - file: sympy
 - caption: Other
   numbered: true
   chapters:
-  # - file: troubleshooting
+  - file: troubleshooting
   - file: status