Since 1986, the Princeton Geniza Lab has been studying and digitizing historical documents from the Cairo Geniza, a cache of roughly 400,000 fragments of paper and parchment preserved in a medieval Egyptian synagogue. The Geniza Lab studies the geniza's ephemeral, everyday texts — unique sources for the history of the Middle East and of premodern Jewish communities from Spain to Sumatra. The documents include letters, legal documents, accounts and lists.