:rss: Hacker News on Nostr: What are these bumps on the top of a pull-tab can? ...

What are these bumps on the top of a pull-tab can?
https://old.reddit.com/r/whatisthisthing/comments/1i5ztq4/comment/m8a7m8m/
#ycombinator #reddit #reddit_com #vote #comment #submit