Title: Pochemu tak byvaet?
Description: Why is the grass green and the sea salty? Why is there day and night? Why is the sky blue and the snow white? Martha Gumilevsky book "Why it happens?" helps parents to properly  answer the most difficult questions for children.
Subjects: Illustrated children's books, Specimens, Children's encyclopedias and dictionaries, Russian, Russian language materials
Places: Russia
Time periods: 21st century