A modern 777 jetliner is an absolute marvel of engineering. Yet (unlike on smaller planes) the overhead bins are almost, but not quite, deep enough for standard carry-ons to go in wheels-first. And almost, but not quite, wide enough to fit three lengthwise. So you can only get two in a bin. A tiny modification to their design could have increased the bins’ capacity by 50%.
I used to have a fax machine which required fax paper rolls, which was fine; the rolls were cheap, lasted almost forever, and were a snap to change. Finally it broke and I had to replace it, and found that ones like that are no longer made. Now they’re all “plain paper” fax machines.

Technological progress – you gotta love it. God bless our engineering geniuses.
