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A complete wiring diagram of the human brain would contain roughly 100 trillion synapses. Connectomics is the field attempting to map them — starting with the roundworm, scaling toward us.

Neuroscience produces spectacular images and spectacular overreach. The replication crisis hit brain imaging hard — many published findings don't hold up. Here's a sober tour of what the field has actually proven, what remains genuinely uncertain, and how to read the next breathless headline.

You don't see the world — you see your brain's best guess about it. Predictive processing flips neuroscience upside down: the cortex is a prediction engine, and sensory signals are just correction signals.

Neuroscientists once dismissed brain activity during rest as noise. Then they found the default mode network — a highly organized system that activates precisely when you stop focusing on the world.

The brain has its own immune cells — microglia — and when they stay in attack mode too long, the collateral damage looks a lot like psychiatric illness. Neuroinflammation is now a serious hypothesis for depression, Alzheimer's, and schizophrenia, reframing mental illness as partly an immune problem.

Neuralink's first human patient moved a cursor with his thoughts at speeds competitive with a mouse. But the gap between 'paralyzed patients controlling computers' and 'merging human cognition with AI' is enormous — and often glossed over in the coverage.

BMIs aren't a future technology — they're a present one with real patients and expanding capabilities. The gap between the neural signal and a useful command is closing, and that has implications for medicine, identity, and what we mean by agency.