Mechanical neural networks: Architected materials that learn behaviors A synthetic protein-level neural network in mammalian cells A cell signaling model as a trainable neural nanonetwork Single cortical neurons as deep artificial neural networks The neuron computing an XOR function: Dendritic action potentials and computation in human layer 2/3 cortical neurons Gene regulatory networks exhibit several kinds of memory: Quantification of memory in biological and random transcriptional networks...