Alicia is a very curious girl. She wants to understand everything. Rainy days are the best ones for asking questions. How do we know if something is alive or not? How does a cell work? What's inside it? Go with Alicia and her father on a journey to the inner life. Let yourself be fascinated by the world of cells, DNA and mitochondria. Nothing is too complicated if you have a good guide to take you. Discover, through science, the wonder of life. Notable features: • an exciting trip through the insides of living beings. • A collaboration between a leading scientist and humanist and a winner of the Premio Nacional de Ilustración. • Includes an appendix with the most relevant concepts. An essential school book. • Ideal for avid readers looking for answers.