…with lunar and Mars regolith simulants.
If Congress and NASA were serious about opening space to humanity, this is the sort of thing that NASA would be spending more money on, instead of a monster rocket.
[Update a while later]
Related, I think: Questions that the Trump transition team asked NASA.
The use of a biopolymer as a binder was interesting. This could be a low mass way of producing a range of interesting organic materials.