[londons_explore]

There are a few neat and potentially evil things you can do with copper traces alone. For example, you might be able to make a spy radio emitter[1].

Despite this, I very much doubt any software is going to be inserting those into designs automatically anytime soon!

[1]: https://en.wikipedia.org/wiki/The_Thing_(listening_device)

[mhh__]

The thing did have more than just wires, it had to have a membrane to actually work as a microphone.