The book in an accessible and popular form tells about the basic laws of physics and chemistry, as well as phenomena from the field of botany and biology. With the help of simple experiments, the child will understand how clouds form and rust appears, how our heart and lungs work, why soap bubbles are round, and the needle rests on the surface of the water. Children will be able to design their own solar stove, parachute, periscope, water and sundial, and even a comet. The description of each phenomenon and experiment is illustrated by color drawings. The book will be of interest to children from 9 to 14 years old.