The Bulletin of the Atomic Scientists changes its format from a newsletter to a magazine. Its first cover features a clock, both conceptualized and designed by artist Martyl Langsdorf. At the time, Langsdorf designed it because “it seemed the right time on the page … it suited my eye.” This purely aesthetic design later becomes known as the “Doomsday Clock,” one of the most recognizable and lasting icons in popular culture to convey the urgency of nuclear danger. For decades to come, the Clock’s hands move based upon whether events push humanity closer to or further from nuclear apocalypse. The Clock later includes dangers posed by climate change and other existential threats.