At 4:50 a.m. on September 3, 1967, all Swedish traffic came to a halt, every vehicle carefully moved from the left lane to the right, then set off again at 5 a.m. This was 'Dagen H', H-Day, for Högertrafik, right-hand traffic. The change went ahead despite a 1955 referendum in which more than 80% of voters had rejected it. Surprisingly, accidents initially fell: nervous drivers were simply more careful.
Around 2300 BCE, Enheduanna, daughter of King Sargon of Akkad, became high priestess of the Moon god at Ur. She composed hymns to the goddess Inanna and put her name to them. She is the oldest person identified as the author of a literary work, about 1,500 years before Homer.
Squeeze Earth's 4.5 billion years into a single 24-hour day. Homo sapiens shows up around 11:59:54 p.m., roughly six seconds before midnight. All of written history, from Sumerian tablets to today, fits into the final tenth of a second. A cosmic blink.