Welcome back to the wonderful world of chemistry. A world that becomes more beautiful and exciting as you grow older. Have you ever wondered why the orange juice we drink has a sour taste? Why do we need to use appropriate medicine depending on the type of insect that bites us? Why should we not clean the marbles in our house using any liquid? How are the clay, glass, and ceramic objects in our house made? How can we make useful products for our everyday life from petroleum? These are just some of the questions for which you will find the answers in the chemistry of the 3rd grade of high school. [...]

(from the author's preface)