For just a few examples from people I know:
- nth-dimensional cosmological wackiness which is effectively a cyborg
- extremely stretchy nanites
- perfluorocarbons
- whatever you get when you distill countless universes
- miscellaneous petrochemicals
- liquid latex
- literally just made of plain old magic with no scientific window dressing
- Water (inexplicably alive and capable of forming itself into an animal pooltoy)
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