Do you know what gene modification would be useful, Bernd? If the foodstuff we produce displayed its nutritional facts. Each individual product (like an egg) would gather this info from within itself, and would display it somewhere (leik on the shell) how much nutrients it contains. No more average bullshit, we could know for sure in case each individual items we consume.
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I haven't looked into the details, but it's a good question how feasible is it on large scale. How giant dunes we would need to build.
It could be awesome if one could build a concrete tub with some cubic meters of sand in the garden and use that. Cheap as fuck, basically never breaks down. Then state would start regulating it, only certified companies could install for millions of HUFs, after 3 official inspections (each costing much), with additional safety gadgets which would need regular maintenance, and replacement parts and certified mechanics to repair.