The Academica (also On Academic Skepticism, Academici Libri or Academic Books) is work in a fragmentary state written by the Academic Skeptic philosopher, Cicero, published in two editions. The first edition is referred to as the Academica Priora. It was released in May 45 BCE and comprised two books, known as the Catulus and the Lucullus. The Catulus has been lost. Cicero subsequently extensively revised and expanded the work, releasing a second edition comprising four books. Except for part of Book 1 and 36 fragments, all of the second edition has been lost. The second edition is referred to as Academica Posteriora or Academici Libri or Varro. The Academica was the second of five books written by Cicero in his attempt to popularise Greek philosophy in Ancient Rome, and it is the only one of the five books that exclusively focused on promoting Academic Skepticism, the school of Hellenistic philosophy to which Cicero belonged. It was preceded by the now-lost Hortensius which argued that the pursuit of philosophy is the most important endeavor one can engage in their leisure time. Source: Wikipedia (en)