Version 5.0 of Microsoft’s flagship spreadsheet program Excel came out in 1993. It was positively huge: it required a whole 15 megabytes of hard drive space. In those days we could still remember our first 20MB PC hard drives (around 1985) and so 15MB sure seemed like a lot.

By the time Excel 2000 came out, it required a whopping 146MB … almost a tenfold increase! Dang those sloppy Microsoft programmers, right?

Wrong.