New fossil evidence seems to confirm that a key ancestor of ours could walk upright consistently - one of the major advances in human evolution.

BBC: Fossil find puts 'Lucy' story on firm footing

There is some evidence that much older hominids could walk upright.

BBC: NEWS | Science/Nature | Scientists unearth early skeleton

And the voice from Galilee, which would defy Caesar, offered a new Kingdom in which each man could walk upright and bow to none but his God.

WSJ: In Hoc Anno Domini

The simplest theory is that these swellings dwindled to nothing after our ancestors began to walk upright, because the costs of advertising ovulation in this way came to outweigh any benefits.

NEWYORKER: It Ain��t Necessarily So

Her leg bones confirm that A. afarensis could walk upright, though her ape-like upper body and the arrangement of the semi-circular canals of her ears, which are the location of the sense of balance, suggest she also spent a lot of time climbing trees.

ECONOMIST: An ancient child has been discovered

During the chant they walk through the church towards the chancel, the singer carrying a sword in his or her hands, held upright in front of the face, while the altar boys or girls carry candles.

UNESCO: Culture