SharePlusRecent genetic analysis suggests that trillions of microorganisms in the human gut microbiome have accompanied humans since ancient migrations out of Africa. These microscopic companions provide a unique biological record of how our ancestors populated the globe tens of thousands of years ago.
The exact timeline of when the first humans arrived in the Americas remains a subject of intense scientific debate. Researchers continue to analyze genetic, archaeological, and environmental data to determine if migration occurred before, during, or after the Last Glacial Maximum. Recent analyses of ancient DNA are beginning to offer fresh clues, shedding light on this enduring historical mystery and helping scientists better understand the peopling of the New World.