Why doesn't a ship sink? Where do the colors in a rainbow come from? Why does ice take up more space than water? Children ask just as clever questions as the curious cat Findus. Luckily, old Pettersson has an answer to almost every question and explains the world with exciting experiments and inventions. With this book, children can build, glue, craft, and experience things themselves, playfully and joyfully making their very first experiences with the sciences. Many different topics are covered, including water, time, colors, air, sounds, and magnets.