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 sensor ...

We’re going to let you decide which of these two projects is a delight, and which is amusing. The project on the left is a desktop kinetic sculpture. We like it because of its size and simplicity. A ...