The piezoelectric effect is simple in its rules: Apply mechanical stress to a material and you generate an electric charge. The inverse is also true: Apply a voltage to a material, and it changes ...

[Jason] has continued to plug along with his sonar build and recently showed up a monostatic active sonar using a piezo element and microphone. Regular readers will remember [Jason’s] experiments from ...

In today's concrete jungle, pavement takes up a lot of space, so we might as well cram some smarts in there. Previously we've seen ground coverings that light up, absorb solar energy, generate ...