Blaise Pascal (1623–1662) was verified through Encyclopaedia Britannica, the Stanford Encyclopedia of Philosophy, and MacTutor History of Mathematics. Britannica confirms his birth and death dates, mathematical and scientific achievements, the Night of Fire, and his later religious-philosophical writing. Stanford confirms the Memorial, carried sewn into his coat, and the Pensées as posthumous fragments of a planned apology. MacTutor confirms the calculating machine, pressure/vacuum work, probability correspondence with Fermat, the carriage-accident tradition, and his death in Paris at thirty-nine. His worth is compression: he made uncertainty measurable and the human abyss speakable.