Past related threads:
Bette Graham, the inventor and founder of Liquid Paper (2019) - https://news.ycombinator.com/item?id=22533312 - March 2020 (13 comments, pretty bad)
Bette Nesmith Graham, Who Invented Liquid Paper - https://news.ycombinator.com/item?id=17513500 - July 2018 (16 comments, better)