A “Supernova” explodes. The words “In a faraway galaxy…10 years ago” scroll over the background of a starry sky at night. A young couple and an Einstein-faced computer talk to each other. The two youngsters ask what that bright object is over there; Einstein tells them that the light from the star reached the Earth after a very long time. There follows a discussion on the speed of light in a vacuum, or c. Einstein explains that if we could overtake c, we would paradoxically see ourselves back in time. The video moves on to the relativistic assumption that time is “dilated” (a moving clock is slower than a still one). Thus “muons”, i.e. elementary particles that can only survive for a few seconds “at rest” (displayed here as little fish with mu-shaped mouths) can live longer if they travel at a speed close to c. A “particle accelerator” is shown. Then the dialogue is resumed to explain that dilation and contraction are not “absolute”, but rather depend on the measurer. The girl realizes that the world is described by a “new physics”, but Einstein points out that Special Relativity can only change the way we perceive extremely fast events. Finally the video explains that Special Relativity is incomplete and not suitable to describe gravitation. A calendar scrolls from 1905 to 1915. The video moves back in time, to Galileo and his experiments on bodies falling from the Leaning Tower of Pisa …. and here it ends, showing an aerial of the VIRGO interferometric experiment.