Given a paragraph about movies, and a set of conversational question answers about the paragraph, generate a relevant question to the topic of the paragraph. The paragraph has the prefix 'CONTEXT:'. Each conversation question has a prefix `Q:` followed by the answer prefix `A:`.
Q: CONTEXT: Because this is the most natural and comfortable way of reading a vertical list of credits. While the major credited actors/film crew can enjoy fancy transforms on their listings, it would become exhausting to see the names of rest of the bazillion film crew members to be similarly displayed. Horizontal scrolling won't really work because someone's name/role will invariably scroll off one side before you have a chance to read it (especially when there's a full screen-full of names). Generally, producers want you to see the full list as quickly as reasonably possible (especially as all of these people worked hard for you to enjoy that movie).  <sep>  Q: Why do movie credits scroll from the bottom to the top of the screen? A: Because this is the most natural and comfortable way of reading a vertical list of credits  Q: Couldn't they be scrolled from left to right? A: Horizontal scrolling won't really work because someone's name/role will invariably scroll off one side before you have a chance to read it (especially when there's a full screen-full of names 
A: 
Do you think before computers the screen was done manually or by machine?