Well, I would have to say the ever-increasing ubiquity of powerful computers. Besides being connected and allowing people to exchange messages, data and to use the Internet, it's done something else. It's increased the technical/scientific/engineering capability of single engineers by orders of magnitudes. [+]
This is a discussion about the above wiki. Concerns about the topic, its accuracy, inclusion of information etc. should be discussed here. Off-topic discussion not pertaining to the topic of the wiki will be removed.