This was submitted at least twice last week, does anyone have the link to the original that was on the front page 6 days ago? There were some useful comments.

This was submitted at least twice last week, does anyone have the link to the original that was on the front page 6 days ago? There were some useful comments. My search skills are failing me righ tnow and all I've found is this one from 5 days ago: https://news.ycombinator.com/item?id=6954463 https://news.ycombinator.com/item?id=6954463