Tatu and Patu Inventors

Brothers Tatu and Patu are tireless inventors. They came from a distant land called Chudlyandia, where everything is arranged quite differently. Tatu and Patu study various subjects and phenomena and want to make the world a little bit better. They have invented 14 devices that will undoubtedly be useful to every child!
You quickly get used to convenient inventions - be careful, what if you later can't enter a room without a book scaring device or wake up without a wake-feed-dress apparatus?
Do you want to know how they work?
Hurry up and open the book and study!