~~No, really. He's talking about the earths surface, the xkcd is about the earths volume.~~ Ok, the xkcd is about nanobots with a volume of "a few cubic micron

~~No, really. He's talking about the earths surface, the xkcd is about the earths volume.~~ Ok, the xkcd is about nanobots with a volume of "a few cubic microns"[1], whereas atoms are much smaller. [1] https://www.explainxkcd.com/wiki/index.php/865:_Nanobots https://www.explainxkcd.com/wiki/index.php/865:_Nanobots