One September day, it started to snow inside MIT's Pierce Laboratory. Researchers depressurized a tank of liquid carbon dioxide (CO2), instantly freezing it and releasing solid flakes. These were blended into cement paste and pressed into disks roughly the size of a dime, each sealed with a thi...
Source: [Phys.org](https://phys.org/news/2026-06-reveals-hidden-cement-chemistry-stronger.html)