This year marks 150th birthday of the Periodic Table, a major step toward creating a unified perspective on our understanding of the elemental nature of all matter. To commemorate this achievement, NOVA science faculty have prepared a series of presentations on the table, its creator–Dmitry Mendeleyev–and many interesting and curious facts that emerged as our knowledge of the Periodic Table has evolved for well over a century. Presenters: Mihaela Chamberlin, Katherine Geiser-Bush, Bech Schomber, and Pirabalini Swaminathan.