diff --git a/01_Code/physical_computing_interface/simulation/demos/indexBeamComparison.html b/01_Code/physical_computing_interface/simulation/demos/indexBeamComparison.html
index 5b0ff5b7d78480c447d00cd673c0df9a1e197e46..c59a11e376f06c542bc20a78d388b461f223655b 100644
--- a/01_Code/physical_computing_interface/simulation/demos/indexBeamComparison.html
+++ b/01_Code/physical_computing_interface/simulation/demos/indexBeamComparison.html
@@ -22,7 +22,7 @@
 
         <div id="threejs">
             <div class="header1">
-                    <i> Hierarchal Simulation</i>
+                    <i> Hierarchical Simulation</i>
                     <!-- Three.js -->
             </div>
             
diff --git a/01_Code/physical_computing_interface/simulation/demos/indexHierarchical.html b/01_Code/physical_computing_interface/simulation/demos/indexHierarchical.html
index 0ab3ececef1b264499214a9abe4f4e083850ea12..ce1e4c3a1288187a6d56d5e401f091d4a295e134 100644
--- a/01_Code/physical_computing_interface/simulation/demos/indexHierarchical.html
+++ b/01_Code/physical_computing_interface/simulation/demos/indexHierarchical.html
@@ -22,7 +22,7 @@
 
         <div id="threejs">
             <div class="header1">
-                    <i> Hierarchal Simulation</i>
+                    <i> Hierarchical Simulation</i>
                     <!-- Three.js -->
             </div>
             
diff --git a/01_Code/physical_computing_interface/simulation/demos/indexWhale.html b/01_Code/physical_computing_interface/simulation/demos/indexWhale.html
index 262732bfbf37a7b777d0ff14b6de2a5dde892d39..bd564b5dbf4e97dec350fc019a8f06cb28c2e830 100644
--- a/01_Code/physical_computing_interface/simulation/demos/indexWhale.html
+++ b/01_Code/physical_computing_interface/simulation/demos/indexWhale.html
@@ -22,7 +22,7 @@
 
         <div id="threejs">
             <div class="header1">
-                    <i> Hierarchal Simulation</i>
+                    <i> Hierarchical Simulation</i>
                     <!-- Three.js -->
             </div>
             
diff --git a/README.md b/README.md
index e6cf3800a9f33a259c82268338db1a6af8c60145..51fb8a6f41b73c9983a15baee88bfafc8eaa5763 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Topics include:
 
 - **"Physical Computing Interface"** 
   - [Assembler Control Demo](https://amiraa.pages.cba.mit.edu/physical-computing-design-tools/01_Code/physical_computing_interface/index.html)
-  - [Voxel Simulation Demo](https://amiraa.pages.cba.mit.edu/physical-computing-design-tools/01_Code/physical_computing_interface/index.html)
+  - [Voxel Simulation Demo](https://amiraa.pages.cba.mit.edu/physical-computing-design-tools/01_Code/physical_computing_interface/indexSimuation.html)
   - [Convolutional Neural Network (CNN) Demo](https://amiraa.pages.cba.mit.edu/physical-computing-design-tools/01_Code/physical_computing_interface/demos/indexDNN.html)
 - **"Performance Calculation Graph"** demo lives [here.](https://amiraa.pages.cba.mit.edu/physical-computing-design-tools/01_Code/physical_computing_interface/probabilisticProjections/index.html)
 - [Distributed Deep Neural Networks](https://gitlab.cba.mit.edu/amiraa/ddnn)