This science-themed series emerged from the efforts of executive producer Paula S. Apsell and popular physicist Brian Greene, who formerly hosted the series THE ELEGANT UNIVERSE. In this four-part program, Greene takes on such lofty subjects as the nature of time, space, quantum mechanics and reality itself. He also discusses abstract ideas, such as the fact that empty space is anything but empty, and the notion that time per se may be a vast illusion. The four episodes include: WHAT IS SPACE?, THE ILLUSION OF TIME, QUANTUM LEAP and UNIVERSE OR MULTIVERSE. The series was co-funded by the Alfred P. Sloan and Arthur Vining Davis foundations, and produced by the PBS affiliateWGBH Boston.