About a dozen species of native grasses were initially used to build fresh soil above and below the contaminants, effectively “sandwiching” them between the soils.

Source: https://www.mcall.com/2023/03/20/mountain-areas-in-palmerton-superfund-site-to-receive-another-reseeding/

In their theoretical study, Ren's team examined a group of four of these materials: with one surface composed of either selenium or tellurium, and the other from either bromine or iodine—with both sides sandwiching a middle layer of astatine.

Source: https://phys.org/news/2023-02-2d-janus-materials-harvest-abundant.html