Fossil find puts 'Lucy' story on firm footing

    New fossil found at Hadar, Ethiopia seems to confirm that a key ancestor of ours could walk upright consistently - one of the major advances in human evolution.
   Palaeo-scientists knew A. afarensis spent some of its time standing tall; that much has been clear since 1974 when they first examined a skeleton of the species, famously dubbed "Lucy", also found near the village of Hadar in the Ethiopian rift valley.