Links to previous weeks' Idea Sunday posts for reference:

Last week:

https://news.ycombinator.com/item?id=7654771

2 weeks ago:

https://news.ycombinator.com/item?id=7616910

3 weeks ago:

https://news.ycombinator.com/item?id=7582077

4 weeks ago:

https://news.ycombinator.com/item?id=7541601