We seem to cover her work a lot here. Her latest video above covers how she created a point contact transistor from a 1N34 germanium cat whisker diode. After opening the glass casing on the diode ...

With nothing more complex than a germanium point-contact diode and an oscilloscope, you can quickly, easily, and cheaply resolve microwave signals, as we are shown with a 2.4GHz wireless mouse.

Instead of bothering with tiny wires, Brattain attached a single strip of gold foil over the point of a plastic triangle ... current came out the other contact. Here's why it worked: Germanium ...