Title: La racine carrée de Klonk
Subjects: Klonk (Personnage fictif : Gravel), Romans, nouvelles, etc. pour la jeunesse, Telekinesie, Bourse, Crises economiques, Racine carree, Science-fiction, Klonk (Fictitious character : Gravel), Juvenile fiction, Teleportation, Stock exchanges, Depressions, Square root, Science fiction