- Concrete superconductor batteries that would work in datacenters with controlled relative humidity, but don't work unless kept dry: "Low-cost additive turns

- Concrete superconductor batteries that would work in datacenters with controlled relative humidity, but don't work unless kept dry: "Low-cost additive turns concrete slabs into super-fast energy storage" (2023-08) https://news.ycombinator.com/item?id=36964735 https://news.ycombinator.com/item?id=36964735