ORIGINAL ART BY JOHN Hawks. Cover, Robert Clark; Jacket Flap, Brett Eloff, Courtesy of the University of the Witwatersrand; Gallery 1: 1, Brent Stirton/Getty Images Reportage; 2, Courtesy of Lee Berger; 3, Courtesy of Lee Berger; 4, Brent Stirton/Getty Images Reportage; 5, Courtesy of the University of the Witwatersrand; 6, Courtesy of the University of the Witwatersrand; 7, Brent Stirton, Courtesy of the University of the Witwatersrand; 8, Brent Eloff, Courtesy of the University of the Witwatersrand; 9, Courtesy of the University of the Witwatersrand; 10, Ismael MonteroVerdu, Courtesy of the ESRF and the University of the Witwatersrand; 11, Ismael MonteroVerdu, Courtesy of the ESRF and the University of the Witwatersrand; 12, Brett Eloff, Courtesy of the University of the Witwatersrand; 13, John Gurche/National Geographic Creative; 14, Brett Eloff, Courtesy of the University of the Witwatersrand; 15, Brett Eloff, Courtesy of the University of the Witwatersrand; 16, John Gurche/National Geographic Creative; 17, John Gurche; Gallery 2: 18, Courtesy of John Hawks; 19, Ashley Kruger; 20, Herman Verwey/Foto24/Gallo Images/Getty Images; 21, Robert Clark; 22, Robert Clark; 23, Robert Clark; 24, Elliot Ross; 25, Garrreth Bird; 26, Rachelle Keeling; 27, Courtesy of John Hawks; 28, Robert Clark; 29, Peter Schmid; 30, Courtesy of John Hawks; 31, Courtesy of John Hawks; 32, Robert Clark; 33, John Gurche; 34, Courtesy of John Hawks; 35, Jon Foster/National Geographic Creative.