In his cheerful and at the same time deep book, the Spanish scientist and writer Pedro Gonzalez Calero talks about the history of philosophy, about what philosophers laughed at, and about that. how they laughed at themselves. He invites the reader on an exciting journey through time and space, to visit Diogenes, Confucius, Voltaire. Diderot, Russell, Heidegger and other thinkers of the past.