Plastic Radiation Shielding

[stevebowers]

There is a soil-substitute in OA known as Garden Paste that presumable reduces the need for minerals in the crop-growing substrate. In a habitat or long-duration ship that grows its own food, the majority of that food would probably be vat-grown like algae; much of the rest will be grown aeroponically or using a minimal amount of Garden Paste, and only a small amount will be grown in the traditional way using mineral-based soil. So there might not be as much rock on a habitat as one might expect.

(Currently Garden Paste is one of the aspects of the scenario which needs expansion; currently the article takes the form of an advertisement or instruction sheet from a Garden Paste manufacturer, which is interesting as ephemera, but it needs more detail.)
http://www.orionsarm.com/eg-article/4828f69bed743