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Brain of a fruit fly copied into a laptop Researchers reported a major milestone in neuroscience: the successful computer simulation of an entire adult fruit fly brain using its full wiring diagram (connectome). The fly brain contains about 139,000 neurons and roughly 50 million connections, and scientists reconstructed this network digitally after years of work by the FlyWire consortium mapping every neuron and synapse. The resulting model can run on a standard laptop and uses a simplified “leaky integrate-and-fire” neuron model to simulate neural activity. To test the model, researchers simulated sensory inputs such as taste and touch. The virtual brain successfully predicted which neurons would activate and what behaviors would occur, such as extending the fly’s proboscis to eat sugar or grooming its antennae when stimulated. These predictions were later confirmed experimentally in real flies, showing that the connectome can meaningfully explain how neural circuits produce behavior. The research demonstrates the power of complete brain wiring maps for understanding how neural circuits work. Beyond basic neuroscience, such simulations could help study brain disorders caused by faulty neural connections and inspire new approaches in artificial intelligence. Researchers see the fruit fly as a first step: the next targets are mouse brain connectomes, with the long-term goal of eventually modeling the human brain once its diagram becomes available. https://youtu.be/bZVoPJumx8Y