On this day

October 7 in history

A date of mysteries and power: Poe's unexplained death, the march into Tibet, a Leningrad birth, a gentle city cartoon, and a new way to hear music.

October 7 opens with an unsolved puzzle. In 1849 Edgar Allan Poe died in a Baltimore hospital, days after he was found delirious in a tavern on an election day, and nobody has ever explained what happened to him. A century later the date turned to force and state power. In 1950 Chinese troops crossed into the Chamdo region of eastern Tibet, starting the brief campaign that led to Tibet’s annexation. Two years later, in 1952, Vladimir Putin was born in Leningrad, a city still marked by its wartime siege, and he grew up to lead Russia for more than two decades.

The later anniversaries are lighter in tone. In 1996 Nickelodeon premiered Hey Arnold!, a cartoon that found warmth and wonder in the streets of a fictional city. In 2008 Spotify opened its streaming service in Europe, offering a legal alternative to piracy and changing how much of the world listens to music. From a Gothic poet to a streaming app, the date spans grief, conquest, and invention.