Aging is an extension of the developmental program into a phase of self-destruction. This much has become clear (if not yet uncontroversial) over the last decade. But this insight is of little use to us so long as developmental biology is so poorly understood. I have worked from a perspective in which development and aging are both driven by gene expression—an epigenetic program. Then, last week, I learned about an electrical dimension of developmental biology that is entirely new to me. I’m grateful to Johnny Adams for pointing me to a recent Stanford lecture by Michael Levin, summarizing two decades
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