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The episode involving Frederick II of Prussia and his visit to a Berlin prison is one of the most famous anecdotes associated with Enlightened absolutist rulers of the 18th century. 📜 According to the account, during an inspection of the prison cells, Frederick encountered numerous inmates who insisted they were innocent, claiming to be victims of wrongful sentencing, conspiracies, or unjust accusations. 🕯️ Each prisoner attempted to persuade the king of his innocence, hoping for release. 🙏 T

Evolving invention of Fiber Optics 🧵 The invention of fiber optics is one of the most powerful stories in human innovation, tracing how we learned to control and transmit light itself. It began in the 1840s, when Daniel Colladon and John Tyndall demonstrated that light could bend inside a stream of water through total internal reflection — the same principle that powers fiber optics today. In the 1930s, Dr. Heinrich Lamm used tiny glass bundles to transmit images, paving the way for optical ima