Meanwhile, in a high-pressure physics lab…

Melting diamond could unlock triple fusion gain and the secrets of ice giant planets phys.org

Diamond does two odd jobs: it encases fusion fuel pellets, and it is thought to fall as rain deep inside Neptune and Uranus. Experiments and simulations had long disagreed about how it behaves when crushed and melted; a new measurement settles the argument, and points toward tripling the energy gain from inertial confinement fusion.