Someone on tumblr asked why 3.5" floppy disks seem so much more friendly (or "pleasant and edible" to use their terminology) than 5.25" floppy disks, so I wrote about it:
https://www.tumblr.com/foone/750216135935492096/why-do-35-inch-floppy-disks-seem-so-much-more
TL;DR: It's because Sony.