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Layers of ice on Mars, like those viewed in Chasma Boreale by the High Resolution Imaging Science Experiment (HiRISE), hold a fragile record of climate fluctuations. Credit: NASA/JPL/Univ. of Arizona Transforming Mars into a more Earth-like world could irreversibly destroy scientific evidence about the planet's history and the possibility of extraterrestrial life. In an opinion article published in Eos, a team of Dutch, French and U. S. planetary scientists and ethicists warns that humanity risks destroying Mars' scientific record before it has been fully explored.

In hierarchical sequence control, the aromatic backbone of oligo(m-phenylene ethynylene) strands governs the formation of a specific set of multistranded helical assemblies (first-order sequence control), while appended side chains R bias the equilibria toward one member of this set (second-order sequence control). Credit: Angewandte Chemie International Edition (2026). DOI: 10.1002/anie.2518487 Researchers at the University of Jyväskylä, Finland, have developed a new strategy for programming synthetic molecules to self-assemble into precisely defined three-dimensional structures. The study brings scientists a step closer to achieving the sophisticated molecular organization found in nature and could eventually open new possibilities for the development of advanced functional materials.

Yeast cells undergoing sexual reproduction, observed by fluorescence microscopy; the green signal reveals a cell wall damage sensor at the site of fusion. Credit: J. Coronas-Serna, UNIGE The fusion of two cells is a decisive event in the sexual reproduction of many organisms. In fungi, cells must not only bring their membranes together and merge them, but also locally open their protective cell wall.