Release 3.4: "Doody Duty" Storyline + argument builder improvements

New Math Storyline "Doody Duty"
We have launched our first math storyline! With funding from NSF's VITAL Prize , we have created the new storyline "Doody Duty", which teaches students about volume and surface area of rectangular prisms. 
This storyline is available from Dr. Joel Zaleski in the Cryo-Bay. And it includes...
Spatial relationships, including shapes and dimension
Using models and physical objects to understand concepts (we've made a brand-new mechanic that allows students to fill containers in-world, which will help to determine volume!)
Using formulae to streamline calculations
Here's a walkthrough of the storyline:
This storyline is currently listed under the "General" module. We will have a module particularly for Math once we have more content.
 
UX Improvements for Argument Builder
We've also made some tweaks to our argument builder. Now students can easily review their evidence before picking a claim.
Also, reasoning word buttons now have a question mark instead of a plus sign -- user testing reve