Physics Today, the flagship publication of the American Institute of Physics, is the most influential and closely followed physics magazine in the world. The mission of Physics Today is to be a unifying influence for the diverse areas of physics and the physics-related sciences. It does that by providing authoritative, engaging coverage of physical science research and its applications without regard to disciplinary boundaries; by reporting on the often complex interactions of the physical sciences with each other and with other spheres of human endeavor; and by offering a forum for the exchange of ideas within the scientific community. With authoritative features, full news coverage and analysis, and fresh perspectives on technological advances and ground-breaking research, Physics Today informs readers about science and its role in society. Physics Today Online, the magazine’s internet home, presents the digital edition of the monthly print magazine and provides a valuable online archive of content going back to 1948. In addition, PTOL extends the magazine’s coverage with daily posts that capture what the physical science community is talking about—and what it will be talking about. Regular content from the magazine’s contributors and editorial staff includes commentaries, book reviews, and coverage of the latest research and science policy developments.