readings for week 8 updated

Please do the following before merging.

• verify things look visually consistent.
• change ed post category from sustainability and cronick ilness to sustainability and games.
• post Ed post, or ping Venkatesh.
• update Ed link in schedule.md.
• update canvas assignment to reflect these readings.
• merge

schedule.md

@@ -335,7 +335,13 @@ In class exercise to form final project groups
 
 {: .homework} Required Reading and Reflection (for Wednesday)
 : 
-- **Required: Respond to the Reading Questions and Preparation Requirements on Ed**. There is only one Ed post you need to make this week in response to either or both assigned readings. [Please post your response in this Ed thread]({site.discussion}/2649283)
+- Watch [Difficulty Vs Accessibility](https://www.youtube.com/watch?v=sPehhHZvKE8&list=PLVEo4bPIUOskja9pfpqceY8qDrykFdubf&index=19) and respond to the following prompt:
+Think of a part of a game you’ve played that is both a source of Difficulty AND an accessibility barrier— how might you redesign it to be accessible while still keeping the satisfying game difficulty?
+- Watch [Detecting and Defending Against Seizure-Inducing GIFs in Social Media](https://www.youtube.com/watch?v=rD1p_2EHq3Y)  and respond to the following prompt:
+Can you think of a potentially problematic effect in a game that you played? Why is it problematic? Is there an option to disable it?
+
+
+- **Required:  [Please post your response in this Ed thread]({site.discussion}/3851117)**
 
 {: .homework} [Group Project Checkpoint](assignments/project-checkpoint.html) Assigned: Group Project Checkpoint
 :