History Lesson

The first part of the story is told from the perspective of a tribe of nomadic humans of the 30th century, in a future where Earth has entered a final ice age. The tribe is travelling toward the equator ahead of glaciers that are descending from the North Pole, but discovers, when they arrive in the last hospitable region of the planet, that glaciers from the South Pole have already almost reached them. The tribe carries with it a few relics from the previous centuries which it considers sacred, although the functions of the various objects have been forgotten. A generation later, just before the two glaciers fronts meet and spell ultimate extinction of the human species, the relics are safely relocated to a cairn on a mountain that stands between the two advancing bodies of ice. Among the relics there is a radio beacon built as an asteroid-tracking device that was never deployed but is still functioning. The second part of the story is told from the perspective of a race of Venusian reptiles who have evolved into intelligent beings capable of space travel in the 5,000 years since the cooling of the Sun. The Venusians travel to Earth and, attracted by the radio beacon, manage to recover the relics of the last tribe of humans, now the only remnants of civilization not buried under ice. The title of the story comes from the attempts of the Venusian scientists to reconstruct the life and times of erect bipeds that once walked on the Third Planet. After centuries of fruitless studies of humankind's last writings found in the relics the scientists believe a major breakthrough when they manage to decipher the working principle of a film reel that apparently contains an animated cartoon short, which ends with a section of text, which no amount of effort and speculation can decipher: "A Walt Disney Production". ==Similarities with other works by Clarke==