During the last Ice Age, so much water was locked in ice that sea levels dropped by more than 100 meters. Between Siberia and Alaska lay Beringia, a vast plain about 1,000 km wide. It was from there that the ancestors of the Indigenous peoples of the Americas reached the continent.
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.