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## Fossils show man walked 3 million years ago ÔÇô Science News, February 16, 1974

On February 16, 1974, Science News reported the discovery of the skull fragment, shin, and thigh bones of a 3-million-year-old man in Ethiopia by anthropologist D. Carl Johanson. This discovery offered concrete evidence that our ancestors walked on two legs over 3 million years ago. This revelation significantly altered our understanding of human evolution and behavior. But exactly when upright walking emerged in human evolution remains a hotly debated topic, as indicated by subsequent fossil analyses.

These analyses have suggested that several hominid species ambled around on two legs about 5 to 7 million years ago. One example is the discovery of an upper leg bone belonging to the 7-million-year-old Sahelanthropus tchadensis, which bears signs of upright walking. However, not all paleoanthropologists are convinced that these features prove a two-legged gait. At the same time, some scientists believe that the bone belonged to an ape that may have walked upright at times.

## Update on the Discovery

The update on the original findings highlights the ongoing debate within the scientific community regarding the emergence of upright walking in human evolutionary history. This serves as a reminder that our understanding of human evolution is constantly evolving, and new discoveries can both challenge and refine existing theories.

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## About the Author

Maria Temming, the assistant editor at Science News Explores and previously the staff writer for physical sciences at Science News, offers a unique perspective on such scientific breakthroughs. With bachelor’s degrees in physics and English and a master’s in science writing, Temming brings a multidisciplinary approach to her writing. Her contributions in translating scientific concepts for a broader audience can bridge the gap between experts and the general public.

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