It’s been 27 years since geologist David Roberts identified some of the oldest footprints of our species ever discovered. The trackway of three footprints was found on the surface of a cemented sand dune (called an aeolianite) near Langebaan on South Africa’s west coast. The tracks were later dated to 117,000 years and were attributed to Homo sapiens; they became popularly known as “Eve’s footprints”.