chunk: In an African desert millions of years ago, a tribe of man-apes faces starvation and competition for a water hole by a rival tribe. They awaken to find a featureless black monolith has appeared before them. Guided in some fashion by the Black Monolith, one man-ape realizes how to use a bone as a tool and weapon; the tribe learns to hunt for food, and kills the leader of their rivals, reclaiming the water hole.