Which inventor gave the world a code of dots and dashes that could carry messages electrically?

In a 1974 referendum, Greece voted to abolish which institution? A 1974 spy scandal ended Willy Brandt's career as chancellor of which country? A 1974 U.S. stamp showed the Headless Horseman pursuing Ichabod Crane from which tale? A 1974 tornado destroyed about half of Xenia, a city whose name means "hospitality", in which state? Which 1975 Robert Altman film centers on a music festival and political rally in its title city? Which 1975 thriller was directed by Steven Spielberg with music by John Williams? At the 1976 Olympics, an entrant in the modern what was thrown out for wiring his épée to score points without touching… A 1976 Gordon Lightfoot song told the story of the sinking of which ore vessel in Lake Superior?