Pieces of flexible, rechargeable yarn batteries can be connected in series to power electroluminescent panel displays. Credit: American Chemical Society

When someone thinks about knitting, they usually don’t conjure up an image of sweaters and scarves made of yarn that can power watches and lights. But that’s just what one group is reporting in ACS Nano. They have developed a rechargeable yarn battery that is waterproof and flexible. It also can be cut into pieces and still work.

Most people are familiar with smartwatches, but for wearable electronics to progress, scientists will need to overcome the challenge of creating a device that is deformable, durable, versatile and wearable while still holding and maintaining a charge...

A powerful new 4D printing technique could one day allow manufacturers to produce electronic devices and their wiring in a single process. Credit: H. Jerry Qi

Scientists report that they have developed a powerful new printer that could streamline the creation of self-assembling structures that can change shape after being exposed to heat and other stimuli. They say this unique technology could accelerate the use of 4D printing in aerospace, medicine and other industries. “We are on the cusp of creating a new generation of devices that could vastly expand the practical applications for 3D and 4D printing,” H. Jerry Qi, Ph.D., says. “Our prototype printer integrates many features that appear to simplify and expedite the processes used in traditional 3D printing...