Sin resolver Casos misteriosos - Unsolved! Mysterious Events - Time for Kids Nonfiction Readers: Level 4.3 - Spanish Edition Author:Lisa Greathouse Imagine a world where fish and frogs rain from the sky, unexplained booms rattle your house, and rocks slide across the ground by themselves. Welcome to planet Earth! Mysterious events are happening around the world. Despite advances in science and technology, these strange events remain unexplained.