Previous discussions:
https://news.ycombinator.com/item?id=6403285 (3 years ago, 91 comments)
https://news.ycombinator.com/item?id=6421017 (3 years ago, 45 comments, related blog post by Scott Aaronson)
https://news.ycombinator.com/item?id=6894292 (3 years ago, 14 comments, flagged as dupe)