Excerpt from the Encyclopaedia Multiverca:

Goo ~ n.

Goo is a generally accepted term for most non-Newtonian substances which exhibit the behaviours of solids and liquids in a time sensitive fashion. Most famous of these is the primordial goo - which supposedly turned into you. These days, it's usually green, sticky, and in a laboratory, unless it's in you or around you. In this case, please expect the unexpected. Green goo is universal in use, from dissolving you to healing you. It just depends on the scientist and the intention with which that particular batch was conceived.

While the rest of the world advanced technologically, the goo samples did not stay idle. Their usefullness surpassed all previous materials, and were included almost every appliance, gadget, and piece of machinery known to man. From fluid couplings to liquid-state processor chips, these packages of green flourescence invaded all aspects of life.

Some scientists developed genetic enhancements with the goo, and grafted animalistic properties into their test subjects, themselves, and their clients. Some preferred canines, another chose felines, yet another took the avian approach. All had at least some success, as a great variety of new appendages were seen amongst mankind. Wings, tails, claws, scales, fur, and feathers were all present in this brave new world, leading to a whole new society being develped. The beast-kin, they called them.

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Others directly implanted self-attuned samples of goo into their grey matter, resulting in severe headaches and improved neural networking. Telepaths came into being, and neural interfaces became reality. Virtual reality became a thing of the past, with true reality receiving a much improved re-vamp with status boxes, attributes, and descriptions available to anyone with the goo-in-you, be it inherited or implanted.

And so, the goo in the laboratory peacefully bubbled away, quietly crystalizing in a long-forgotten lab, with new ages of biotics and technology rising and falling above it. Previous generations had attempted to sample it, but to no avail. After all, it didn't like having itself scooped out of itself. Most people don't like being disemboweled, and neither did the goo. So it dissolved with extreme prejudice - the utensils and probes, and the odd splash on the robots attempting to examine its slimy entrails. For good measure, a couple of drops were sent towards the scientists behind them too. Eliminate the cause of the problem, and it usually goes away, especially if it has third degree chemical burns.

After effervescing for a sustained reaction, the resulting solid precipitate formed a most unusual crystallization of an emerald hue in the shape of a double tetrahedron - the first core. Whether it was the first AI core, or the first dungeon core, nobody knew. After all, the pathetic organic life-forms above had already moved on, leaving it as a failed experiment that couldn't be moved due to its... acidic temprament.