Humans spend about 80% of their time indoors, but keeping track of the air we breathe usually requires expensive lab-grade ...

Perpetual motion devices are either a gag, a scam, or as in the case of this particular toy that [Big Clive] bought on AliExpress, a rather fascinating demonstration of a contact-free inductive ...

Drums! You hit them, and they vibrate. It’s kind of fun. Piezoelectric elements can create electric current when they vibrate. [Will Dana] put two and two together to try and charge his ...

Abstract: This paper reports on a novel piezoelectric micromirror with integrated resonant sensor, which will allow, for the first time, a precise angle measurement for covering very low-frequency ...