Chemistry is the essence of our environment, the Universe and even ourselves. Like any science, it obeys natural laws, like any practice, it is based on the experience of all mankind. Ideas and findings of alchemists, the first quantitative laws, periodic law and periodic system, chemical sources of current, enzymes and metabolism, the effect of hormones on male and female health, useful and harmful alkaloids - these and many other discoveries in the field of chemistry are presented on the pages of this book.