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                         <h2 class="heading">Certificates</h2>
                         <div class="content">
                             <ul class="list-unstyled">
-                                <li><i class="fas fa-certificate"></i> <a href="https://courses.edx.org/certificates/fc89b8f716314d37937bcc3f27ef3205" target="_blank">Statistical Thinking for Data Science and Analytics</a> (ColumbiaX)</li>
-                                <li><i class="fas fa-certificate"></i> <a href="https://courses.edx.org/certificates/7c99af73bf444a67a70eb1853e06092f" target="_blank">Introduction to Computer Science and Programming Using Python</a> (MITx)</li>
                                 <li><i class="fas fa-certificate"></i> <a href="https://cs50.harvard.edu/certificates/6a424e94-390b-453f-b802-2cbba0cd22fe" target="_blank">Introduction to Artificial Intelligence with Python</a> (HarvardX)</li>
+                                <li><i class="fas fa-certificate"></i> <a href="https://courses.edx.org/certificates/7c99af73bf444a67a70eb1853e06092f" target="_blank">Introduction to Computer Science and Programming Using Python</a> (MITx)</li>
+                                <li><i class="fas fa-certificate"></i> <a href="https://courses.edx.org/certificates/25eaaab3a06440999b3af955b67b217e" target="_blank">Data Structures and Software Design</a> (PennX)</li>
+                                <li><i class="fas fa-certificate"></i> <a href="https://courses.edx.org/certificates/fc89b8f716314d37937bcc3f27ef3205" target="_blank">Statistical Thinking for Data Science and Analytics</a> (ColumbiaX)</li>
                             </ul>
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