Louise Leakey: Paleoanthropologist.
"Who are we?" he question takes her to the Rift Valley in Eastern Africa, where she digs for the evolutionary origins of humankind — and suggests a stunning new vision of our competing ancestors.

http://www.ted.com/talks/louise_leakey_digs_for_humanity_s_origins

Contestar:

Que es lo que nos diferencia como especie?

Who are we?