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A true-life scientific adventure story, this thrilling book takes the reader deep into South African caves to discover fossil remains that compel a monumental reframing of the human family tree.. In the summer of 2022, Lee Berger lost 50 pounds in order to wriggle though impossibly small openings in the Rising Star cave complex in South Africa - spaces where his team has been unearthing the remains of Homo naledi, a proto-human likely to have coexisted with Homo sapiens some 250,000 years ago. The lead researcher on the site, still Berger had never made his way into the dark, cramped, dangerous underground spaces where many of the naledi fossils had been found. Now he was ready to do so. . Once inside the cave, Berger made shocking new discoveries that expand our understanding of this early hominid - discoveries that stand to alter our fundamental understanding of what makes us human.