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Scenarios have been discovered in which it is impossible to prove whether or not a machine-learning algorithm could solve a particular problem. This finding might have implications for both established and future learning algorithms.
Wind from the most massive star in the Trapezium cluster in Orion has carved out a large and expanding cavity around the cluster, bounded by a thin, 2,600-solar-mass shell.
The thermal neutron capture cross-section of 88Zr is measured to be 861,000 ± 69,000 barns, the second-largest neutron capture cross-section ever measured.
Implants that electrically stimulate nerves continuously to treat disease can cause off-target effects and pain. An implant that uses light to modulate the activity of genetically modified nerve cells might offer a solution.