Take a look at the excavations at Scladina, a deep cave only recently discovered outside Liege, Belgium, where Neanderthals lived 100,000 years ago. In this video, archaeologist Dominique Bonjean describes some of the finds his team has made in this cave – including a young Neanderthal’s jaw that figures prominently in the first episode of The Human Spark: Becoming Us.

What do you think of Dominique’s answer to our favorite question: what is the human spark?