3. A sort of analog neural net using a biological substrate to perform communication and learning. Basically, I've trained some wild dogs I found in the alley behind my apartment for function approximation. Originally I had intended to use a pretty standard hill-climbing approach, but they kept wandering away when I ran out of treats. My new method arranges them in a series of layers for PAC (provably all canine) learning, with the gradients transmitted by bark-propagation. I've not figured out how to implement convolutional operations in this framework yet, so I might hold off on publishing anything this year.