Phylogenetic trees map the evolution and ancestral relationships of organisms. At least that is the theory. Researchers at the University of Basel have now revealed that for many bacteria this theory is based on mistaken assumptions. These phylogenies are not a reliable indicator of common ancestry but rather reflect how extensively different bacteria have exchanged genes with each other. This finding implies that the theories of how bacterial genomes evolve need to be completely reconsidered.

Hearing sounds that are linked to positive experiences from the past can considerably increase well-being, reduce depressive moods and alleviate behavioral problems in people with memory loss, a study by the University of Zurich in cooperation with clinical partners has found. The work with music and memories also benefits the nursing staff and carers involved.

One thousand newly-minted microrobots created in EPFL labs will soon be deployed at two large-scale telescopes in Chile and the United States. These high-precision instruments, capable of positioning optical fibers to within a micron, will vastly increase the quantity of astrophysics data that can be gathered - and expand our understanding of the Universe.

A team from the University of Geneva studied the ash from volcanic eruptions and discovered two effects of ash sedimentation that will improve our ability to predict the danger posed by volcanic ash clouds.