Ask HN: What’s the most important modern simple invention?
The humble ball point pen.People forget how cumbersome and/or expensive it was to write before cheap ball point pens became a thing. You had to use fountain pens. The cheap ones leaked and were an absolute mess to carry around. The ones that didn't leak were expensive.I can now buy more pens for $100 than I'll ever use in years and just stash them everywhere I want