Posts on comic.
xkcd on password reuse — a painfully accurate comic showing why reusing the same password across sites makes it trivially easy for attackers to compromise everything.
An xkcd comic on Depth-First Search — a classic computer science algorithm illustrated with characteristic xkcd wit for programmers and algorithm enthusiasts.
An xkcd Science Montage comic contrasting how science looks in movies versus actual scientific practice — a funny and painfully accurate observation.
An xkcd comic strip delivering the electrical engineering punchline to the famous Spider-Man quote — with great power comes great current squared times resistance.
An xkcd comic strip on the search for intelligent life — a classic piece of geek humour that says more about humanity than any astronomy paper.