Around 450 CE, Teotihuacan, north of today's Mexico City, probably had over 100,000 inhabitants, making it one of the largest cities on Earth. It was largely abandoned in the 6th or 7th century. Centuries later, the Aztecs wandered its giant ruins and named it 'the place where the gods were born'.
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.