2019 https://news.ycombinator.com/item?id=19184412
2017 https://news.ycombinator.com/item?id=14627711
2015 https://news.ycombinator.com/item?id=9537009
2015 https://news.ycombinator.com/item?id=8941588
Discussed at the time: https://news.ycombinator.com/item?id=5809724