[dsqrt]

DOE [1], NASA [2], NSF [3] already require most research papers to be made publicly available.

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[1] https://www.osti.gov/

[2] https://www.ncbi.nlm.nih.gov/pmc/funder/nasa/

[3] https://par.nsf.gov/

[AstralStorm]

That still leaves most papers in expensive journals or available via institutional access only.

(PubMed, arXiv and biorXiv help a bit with that, but it's still not enough.)