Useful Links The NIST Reference on Constants, Units, and Uncertainty. Most recent published values for constants with uncertainty, bibliographic search for original research articles. http://physics.nist.gov/cuu/Constants/index.html   A Century of Physics Timeline Clickable timeline with brief explanations of historic physics events from 1890 to the present. http://timeline.aps.org/APS/Timeline/ History Exhibits/Selected Great Papers Online exhibits on Curie, Einstien, … Continue reading Services