Ask HN: What’s the most important modern simple invention?
The humble ball point pen.<p>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.<p>I can now buy more pens for $100 than I'll ever use in years and just stash them everywhere I want