Paul Strathern's Kant in 90 Minutes, a book within his "Philosophers in 90 Minutes" series. It provides a concise biography of Immanuel Kant, highlighting his exceptionally rigid routine and secluded life in Königsberg. The book also explores Kant's major philosophical ideas, particularly his critiques of pure and practical reason and his concept of the categorical imperative, explaining their context within the history of philosophy and their lasting impact. Strathern’s writing style is engaging, incorporating anecdotes and quotations to illuminate Kant's life and thought. The excerpt concludes with a brief chronology of significant dates in philosophy.