Linked from
The 22 pages that link to Uranium-235, each with the reason it gives.
Spent nuclear fuelRelated: Some uranium-235 remains in fuel after reactor operation.
GeoneutrinoRelated: Its decay chain contributes geoneutrinos alongside uranium-238 and thorium-232.
Little BoyRelated: This isotope supplied the fissile material in Little Boy's bomb core.
Uranium dioxideRelated: Its fission supplies much of the heat released by enriched UO₂ fuel.