Your brain is a marvellous machine. A squishy pink-grey bag of 87 billion neurons that creates you - what you see, touch, and hear; what you act, do, and say; what you think, feel, and hope. And neurons do all this by passing messages to each other, passing little pulses of electricity: little spikes. Spikes are how neurons do what they do; so understanding the brain means understanding spikes. In “The Spike” we take you to the heart of how your brain works. We bring you the latest advances in our understanding of how neurons work together; and we delve deep into the philosophy of systems neuroscience — of how best to understand the brain and of the limits to our understanding.