The words for numbers are some of the oldest and most conservative words in most languages. The English words for numbers can be traced back to the original Indo-European language, but during the early Middle English period, English speakers began to borrow related number words from Greek, Latin and French. At the same time, the modern Hindu-Arabic numerals were making their first appearance in English documents and inscriptions. In this episode, we explore the history of numbers and the words we use to express numerical concepts.