Harvard researchers have developed OpenMetabolics, an open-source, smartphone-based activity monitor that uses machine learning and leg motion to estimate calories burned.

Harvard researchers report a new way to make ultra-smooth, microscopic mirrors that form high-performance optical resonators, or cavities.

Harvard engineers have developed a new 3D printing method for building soft robots that bend and change shape in predictable ways when inflated. The technique employs rotational multimaterial 3D printing, in which a dual-material nozzle prints filaments with a flexible outer shell and removable inner gel.

Researchers at Columbia Engineering have developed a new gel electrolyte that both improves the lifetime and safety of anode-free lithium batteries, an emerging battery architecture that could dramatically boost energy density while simplifying manufacturing. Although such design promises higher energy density and lower cost, the approach has long been plagued by short battery life and safety concerns caused by unstable lithium plating and parasitic reactions at the electrode-electrolyte interface.

Flexible electronics are often sold on a simple promise: bendable screens, lightweight solar cells or wearable devices that can bend and flex without breaking. But what does that ‘flexibility’ actually look like at the molecular scale, and how does it affect performance?