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Some years ago, I was interviewing a Columbia neurologist for a potential article on imaging. After a tour of her laboratory and MRI scanner, dialogue about the frontal cortex and the mysteries of synapses, she offered a simple declarative sentence: “We are our brains.” I recalled her pithy comment throughout the COVID-19 pandemic, as clinical evidence emerged that the virus had targeted our brains, among other organs, leaving a biological marker on many (most?) of those infected by SARS-CoV-2 (the official name for the virus, distinguishing it from the disease). The evidence includes heightened risk for stroke, breaching of the blood-brain barrier and “brain fog,” which can linger

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