Through the use of curved modules as steps, the Levytator, designed by Jack Levy, an Emeritus Professor of Mechanical Engineering at City University London, can be used in a continuous loop ...

Objects called trajectoids can be 3D printed to match a path so they can roll down it forever – and simulating this could help model how the spin of quantum bits will change over time ...

Joel M. Lerner, a member of the Association of Professional Landscape Designers, is president of Environmental Design in Capitol View Park, Md., and author of “Anyone Can Landscape” (Ball 2001).