In the early 1990s, Doom was famously installed on more PCs than Windows itself—but how many was that, actually?

We all know Doom was so popular, so monumental, that it changed videogames forever. As a society, we're still obsessed with installing Doom on increasingly improbable devices, from pregnancy tests to vapes. But sometimes I run into an old factoid about Doom, some detail from its heyday that I'd forgotten, that still puts it in perspective...
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