This submission comes from this comment from yesterday: https://news.ycombinator.com/item?id=36854960 https://news.ycombinator.com/item?id=36854960 People in 1

This submission comes from this comment from yesterday: https://news.ycombinator.com/item?id=36854960 https://news.ycombinator.com/item?id=36854960 People in 1920s Berlin nightclubs flirted via pneumatic tubes (2017): https://news.ycombinator.com/item?id=36854061 https://news.ycombinator.com/item?id=36854061 (307 points, 1 day ago, 123 comments)