American Karl Deisseroth and Germans Peter Hegemann and Georg Nagel have won the 2026 Nobel Prize in Medicine for developing optogenetics. The technique uses light to control individual nerve cells in the brain. The Nobel Assembly of Sweden’s Karolinska Institute announced the award on Monday. It recognised the trio’s discoveries concerning light-gated ion channels and optogenetics. Deisseroth, 54, Hegemann, 71,…