Good article but some inaccuracies in there. Doom was certainly not unique in how id marketted it. There was a long tradition of shareware where the model was either
(a) give away and see if people will pay
or
(b) give away the first level and see if people will buy the others.
Wolfenstein is an obvious example since it was also by id.

Mystery house was certainly not the first computer game to contain graphics. It was the first text adventure to do so though.

Even if it is a non-endangered salmon shark it's certainly worth pointing out that many sharks are endangered and in general hunting sharks is a pretty damn irresponsible. I'm pretty unhappy you featured this in a "killing sharks, isn't that cool" style.

[Salmon sharks are actually pretty harmless so it makes the story a little less "neat" anyway.]