Update index.html

Author: ezipkin

index.html

@@ -1142,7 +1142,9 @@ <h3 id="outreachPenguinChallenge">Penguin Challenge</h3>
 <section class="example">
   <section class="title">
     <h1>Penguin Challenge: An activity for K-6 STEM outreach</h1>
-    <img src="assets/images/penguin_challenge.png" height="266" width="200">
+    <img src="assets/images/penguin_challenge2.png" width="200">
+	<img src="assets/images/penguin_challenge1.png" width="200">
+	<img src="assets/images/penguin_challenge.png" height="266" width="200">
   </section>
   <section class="content">
     <p>