This chapter considers events that happened during April 1956 in the following five domains: science and technology; politics, society and the economy; entertainment, arts, and culture; celebrity and famous names; and sport. Focusing here purely on developments in science and technology, we consider: the bestowal of the Fermi Award, Einstein Award, and American Meteorological Society Award for Extraordinary Scientific Achievement on the gravely ill von Neumann; the Sixth Rochester Conference at which J. Robert Oppenheimer expresses the need for physicists to clarify the status of K mesons; the publication of the HMS (Humason/Mayall/Sandage) paper on galaxy distances and the Hubble constant; the demonstration of a two-inch quadruplex recording format; the publication of Miller’s argument that limits on short-term memory capacity mean the human brain can handle about seven ‘chunks’ of information; and the election as a Foreign Member of the Royal Society of the chemist Robert Burns Woodward.