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. ~from the Publisher