Archival Science
The Rosetta Disk: Carrying 1,500 Languages on Etched Nickel
The Rosetta Disk, made by the Long Now Foundation's Rosetta Project, is a 3-inch nickel disk micro-etched with documentation of about 1,500 languages. It is purely analog, readable with a 650x optical microscope and no electronics, and designed to last over 2,000 years as a deep-time linguistic key.
Memory of Mankind: A Million-Year Archive in an Austrian Salt Mine
Memory of Mankind, founded in 2012 by ceramicist Martin Kunze, stores human knowledge on fired ceramic tablets deep in the Hallstatt salt mine in Austria. Salt is dry, stable, and self-sealing, and the archive is designed to last about a million years, with ceramic tokens pointing to its location.
Nuclear Semiotics: Warning Future Civilizations About Buried Danger
Nuclear semiotics studies how to warn people up to 10,000 years in the future about buried nuclear waste, given that languages and even symbols drift. Sandia's WIPP marker study proposed hostile architecture, multilingual messages, and ideas ranging from an atomic priesthood to color-changing 'ray cats.'
5D Optical Data Storage: Etching Data into Quartz for Billions of Years
5D optical data storage, nicknamed the Superman memory crystal, writes data as nanostructures inside fused quartz using a femtosecond laser. Pioneered at the University of Southampton, it claims thermal stability measured in billions of years and up to 360 TB per disc, but requires advanced lasers to write.