Researchers at the Helmholtz-Zentrum Hereon recently introduced a fully recyclable ink for 3D printing that is made from the abundant industrial byproduct lignin. This ink, presented in a paper published in the Journal ACS Sustainable Chemistry & Engineering, could substitute fossil-based materials that are currently used to print various consumer goods, product prototypes and technological components. Its unique properties enable the printing of items with excellent resolution, shape stability at temperatures up to 200 °C, and their recycling via a rehydration process. 

Shared e-mopeds are emerging as a solution for medium-distance trips, but do they improve efficiency and equity? A study in Japan found that they cut travel time and distance compared with public transit, especially in lower land-price areas with limited bus and rail service. Yet time-based pricing means these residents often pay more. Researchers recommend revising pricing models and expanding infrastructure to create transport systems that are fairer, more resilient, and more accessible for all.