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+++ b/topics/04_mechanical/index.md
@@ -91,8 +91,10 @@ Add proliner
 
 <iframe width="560" height="315" src="https://www.youtube.com/embed/9dd1w9VAxw0?si=9kcd6ggq5RGd8YOL&amp;start=67" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
 
-### Survey Prisms
+### Robotic Survey Prisms
 
 https://www.sumpoint.io/#services
 
 [Small Robots and Big Projects](https://papers.cumincad.org/data/works/att/acadia21_462.pdf), Maria Yablonina & James Coleman, ACADIA 2021
+
+### Digital Twins