Physics Today is a monthly journal of the American Institute of Physics that has been in circulation for 50 years. Now Physics today is available free online. Lively news and reviews, the latest discoveries,, and a forum for discussion of current issues in physics make up the journal. this month's special focus is on the centennial anniversary of NIST (the National Institute of Standards and Technology) with articles on the physics of atomic clocks, determination of fundamental constants, and more. Letters, book reviews, job and meeting announcements, and new product listings are also presented. The site states that, in the near future, access restrictions will apply and certain services will be available only to subscribers and individual members of societies connected to the American Institute of Physics.