On a complete side note: did anyone else notice that the page changed urls as your scrolled to new articles. However, the page didn't reload. It was interesting

On a complete side note: did anyone else notice that the page changed urls as your scrolled to new articles. However, the page didn't reload. It was interesting, but it broke my browser's back functionality. Since I scrolled down and back up, my browser had ~10 pages in its history before I got back to HN.