We were tracing the history of aviation through the pages of PopSci when we found, in our December 1928 issue, a note. It appeared to be a list of other issues—all flight-related. It had a Web address, too. And it was written on modern PopSci stationery. We visited the URL and discovered an encrypted page within our online archives. We asked our IT department to access it. They couldn't. But while they were trying to hack in, they discovered that others had visited, and recently; there had been a spike in traffic.