On a warm Melbourne day late last year, hundreds of thousands of live human brain cells sat inside a box on a table in Brunswick.While the neurons were too small to see with the naked eye, Brett Kagan, the chief science officer of start-up Cortical Labs, pointed to a large monitor showing ECG-like spikes.These spikes demonstrated the healthy brain cells were responding to inputs from a nearby computer. Put simply, the neurons were learning. Today, Dr Kagan and his team launched the product — cal...