Good one

Rating: 10/10 (4 August 2016)

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.
Millions of years later, a Pan Am space plane carries Dr. Heywood Floyd to a space station orbiting Earth for a layover on his trip to Clavius Base, a United States outpost on the moon. After a videophone call with his daughter, Floyd's Soviet scientist friend and her colleague ask about rumors of a mysterious epidemic at Clavius. Floyd declines to answer. At Clavius, Floyd heads a meeting of base personnel, apologizing for the epidemic cover story but stressing secrecy. His mission is to investigate a recently found artifact buried four million years ago. Floyd and others ride in a Moonbus to the artifact, which is a monolith identical to the one encountered by the man-apes. Sunlight strikes the monolith and a loud high-pitched radio signal is heard.