Ultrasonic levitation is by now a familiar trick: one or more ultrasonic transducers create a standing wave, and small objects can be held in the nodes of this standing wave. …read more (https://hackaday.com/2026/04/27/a-different-kind-of-ultrasonic-levitation/)

Why Solid State Batteries Short
https://hackaday.com/2026/04/27/why-solid-state-batteries-short/

Solid state batteries, we are told, are the new hot battery technology that will replace lithium-ion batteries. Soon. Not that we haven’t heard that before. One reason it isn’t dominating …read more (https://hackaday.com/2026/04/27/why-solid-state-batteries-short/)

Sega Master System Controllers, Now With USB C
https://hackaday.com/2026/04/27/sega-master-system-controllers-now-with-usb-c/