Livio has popularized astronomy and mathematics through books, lectures, magazine articles, and radio and television appearances. He has appeared on TV and radio outlets including PBS, NPR, and CBS to discuss scientific and mathematical subjects. Livio's first book of popular science was "The Accelerating Universe" (2000), which described the theory that the universe was expanding at a faster and faster rate. He explored the possible causes and the theoretical implications of continuing expansion, especially its implications for beliefs about the "beauty" of the scientific laws that govern the cosmos.