Our swift Anselmo, pushed by his own curiosity, took to accompanying the thoughtful man to work. He taught astronomy to groups of young people. The swift tried to get as near as possible to the classroom windows, because he wanted to find out the secrets of the world he could not reach. Thus, he learnt a lot about the planets, about the sun, about the stars, about our Galaxy, and about other galaxies all over the immense universe, but he also discovered - and this was both peculiar and extraordinary - that there are also wonders which cannot be seen by the human eye. So Anselmo the swift finally realized what made the astronomer so thoughtful.