Rare-earth elements (REE) that are crucial for clean-energy technologies are jealously fought over. Policies and programmes to encourage recycling and recovery could reduce tensions. Here we propose a research perspective on a circular economy for REE with three pillars.
Radio Science data from NASA's Insight Mission show a signature linked to the effect of the liquid core on the rotation of Mars. An in-depth analysis of this signature provides new information about the inner structure of Mars.