Post-modernity spans 1945 to 2016 C.E., an era defined by rapid technological acceleration, decolonization, the rise of the internet, and expanding civil rights. This archive collects milestones in science, medicine, governance, and culture from those seven decades of sweeping human progress.
Mariner 9 reached Mars on November 14, 1971, becoming the first spacecraft ever to orbit another planet. Arriving mid–dust storm, it waited out the weather, then mapped 85% of the surface and revealed Olympus Mons, the vast Valles Marineris canyon, and ancient riverbeds — a Mars far stranger and wetter-looking than anyone had imagined.
Salyut 1 reached orbit on April 19, 1971, becoming the first crewed space station and opening the door to actually living in space, not just visiting. That June, the Soyuz 11 crew spent 23 days aboard — a breakthrough shadowed by their deaths on reentry. Every station since, from Mir to the ISS, traces its lineage here.
Imagine drifted into the world in October 1971, a quiet piano ballad from John Lennon that asked listeners to picture life without borders, religions, or possessions. Written at his home in Tittenhurst Park and shaped by Yoko Ono’s conceptual art, it climbed to number three on the Billboard Hot 100. More than fifty years on, its gentle questions still linger.
The first email was sent in 1971, when engineer Ray Tomlinson typed a throwaway string of characters and pinged it between two computers sitting side by side in his Cambridge, Massachusetts office. He also picked the @ symbol as the separator — a split-second choice still shaping how billions of people reach each other today.
Earth Day began on April 22, 1970, when an estimated 20 million Americans gathered at more than 12,000 events to demand their country pay attention to the planet. In New York alone, a quarter-million people filled a car-free Fifth Avenue. Within three years, it had helped shape a generation of landmark U.S. environmental law.
Pocket calculators arrived in the early 1970s, when Japanese firms like Busicom, Sharp, and Casio finally shrank computation down to shirt-pocket size. Busicom’s 1971 commission to Intel even produced the 4004, the first commercial microprocessor. A small device, quietly democratizing arithmetic and seeding the portable computing world we live in now.
Oman abolished slavery in 1970, one of the last countries in the world to do so. The decree came within weeks of Sultan Qaboos bin Said taking power, alongside sweeping reforms that brought schools and paved roads to a country that had few of either. It marked a quiet close to a long chapter.
ARPANET sent its first message on October 29, 1969, when a UCLA graduate student typed “l” and “o” to a computer at Stanford Research Institute 350 miles away before the system crashed. Built by grad students on refrigerator-sized machines, those two letters marked the quiet beginning of the networked world we now inhabit.
Wally Herbert and his three-man team reached the North Pole on April 6, 1969, completing a 3,800-mile surface crossing of the Arctic Ocean that had taken 15 months by dog sled and open boat. Drawing on Inuit techniques Herbert had learned in Greenland, the expedition stands as one of the last great journeys of its kind.
On July 20, 1969, Neil Armstrong stepped onto the Sea of Tranquility, becoming the first human to stand on another world. He and Buzz Aldrin spent just over two hours walking the lunar surface while an estimated 600 million people — roughly a fifth of humanity — watched or listened live. A quiet, staggering moment in our species’ long outward reach.
