Table of Contents
Featured Articles and Invitations from the AMS
Leibniz's Laws of Continuity and Homogeneity
Mikhail G. Katz and David M. Sherry
Mysteries in Packing Regular Tetrahedra
Jeffrey C. Lagarias and Chuanming Zong
Srinivasa Ramanujan: Going Strong at 125, Part I
Krishnaswami Alladi, Editor