Dual head stacks were once a thing, and there was a recent thread about them as well: https://news.ycombinator.com/item?id=26502216 https://news.ycombinator.com

Dual head stacks were once a thing, and there was a recent thread about them as well: https://news.ycombinator.com/item?id=26502216 https://news.ycombinator.com/item?id=26502216