diff --git a/assets/img/jiyue/arrhythmia_simulations.gif b/assets/img/jiyue/arrhythmia_simulations.gif
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diff --git a/index.html b/index.html
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--- a/index.html
+++ b/index.html
@@ -15,6 +15,10 @@
       <img src="assets/img/jiyue/heart_model_for_arrhythmia_ablation.jpg">
       <h3 style="color:#666; text-align: center;">Computational heart model for clinical left atrium arrhythmia ablation.</h3>
     </div>
+    <div class="mySlides">
+      <img src="assets/img/jiyue/arrhythmia_simulations.gif">
+      <h3 style="color:#666; text-align: center;">Arrhythmia simulations.</h3>
+    </div>
     <div class="mySlides">
       <img src="assets/img/jiyue/fiber_effect_experiments.jpg">
       <h3 style="color:#666; text-align: center;">Fiber effect on activation patterns.</h3>
@@ -23,10 +27,6 @@ <h3 style="color:#666; text-align: center;">Fiber effect on activation patterns.
       <img src="assets/img/jiyue/cancellation_effect.jpg">
       <h3 style="color:#666; text-align: center;">Fiber's cancellation effect.</h3>
     </div>
-    <div class="mySlides">
-      <img src="assets/img/jiyue/arrhythmia_simulations.jpg">
-      <h3 style="color:#666; text-align: center;">Arrhythmia simulations.</h3>
-    </div>
     <div class="mySlides">
       <img src="assets/img/jiyue/slab_experiment_of_rotor_arrhythmia.jpg">
       <h3 style="color:#666; text-align: center;">Fiber's effect on rotor arrhythmias.</h3>
@@ -61,9 +61,9 @@ <h3 style="color:#666; text-align: center;">Heart-on-a-chip platform: Low-cost p
     
     <div class="row">
       <div class="column"><img class="demo cursor" src="assets/img/jiyue/heart_model_for_arrhythmia_ablation.jpg" style="width:100%" onclick="currentSlide(1)"></div>
+      <div class="column"><img class="demo cursor" src="assets/img/jiyue/arrhythmia_simulations.gif" style="width:100%" onclick="currentSlide(4)"></div>
       <div class="column"><img class="demo cursor" src="assets/img/jiyue/fiber_effect_experiments.jpg" style="width:100%" onclick="currentSlide(2)"></div>
-      <div class="column"><img class="demo cursor" src="assets/img/jiyue/cancellation_effect.jpg" style="width:100%" onclick="currentSlide(3)"></div>
-      <div class="column"><img class="demo cursor" src="assets/img/jiyue/arrhythmia_simulations.jpg" style="width:100%" onclick="currentSlide(4)"></div>
+      <div class="column"><img class="demo cursor" src="assets/img/jiyue/cancellation_effect.jpg" style="width:100%" onclick="currentSlide(3)"></div>      
       <div class="column"><img class="demo cursor" src="assets/img/jiyue/slab_experiment_of_rotor_arrhythmia.jpg" style="width:100%" onclick="currentSlide(5)"></div>    
       <div class="column"><img class="demo cursor" src="assets/img/jiyue/voltage_map.jpg" style="width:100%" onclick="currentSlide(6)"></div>
       <div class="column"><img class="demo cursor" src="assets/img/zhihao/framework.jpg" style="width:100%" onclick="currentSlide(7)"></div>