• Symmetry

    Symmetry, on first glance a mere detail of arrangement, has unexpected powers, aesthetic, practical—even moral. We find it in physics, families, and the brain. As shorthand, it heightens our powers of observation, helping us recognize faces and calculate particle interactions. As organizing principle, it steers genes and galaxies. Scientists, long ago convinced that it is […]

  • Mutation

    Mutations make us what we are, linking and blurring the harmful and the helpful. Even the most intricate biological mechanisms, with the most important functions, are already slipping into the future to do something else. In this issue, we trace the outlines of a world that is continually abandoning and inventing itself, often with our […]