★ Reprinted multiple times—truly authoritative! Scientists vet the facts, writers craft engaging stories, and illustrators bring fantastical worlds to life, all working together to create this fun science series that kids can’t put down!
★ Each book begins with Tim’s everyday questions and, through a magical adventure inside the body (or into the microscopic world), transforms complex scientific concepts into stories that children can easily understand.
★ Topics like metabolism and nutrition, brain science, and microbiology—concepts that may sound daunting—become lively, interesting, and accessible in Tim’s adventures.
★ Narrated for young readers by author and screenwriter Maria Kosovskaya, whose work has been licensed for publication in China, the Czech Republic, and Ukraine!
★ Sample chapters in English are available.

The “Tim’s Adventures in the World of Science” series comprises three books:
“The Disappearing Appetite: Tim’s Journey into the Kingdom of Metabolism” (Turns out, behind every bite of food lies a bustling, fascinating microscopic world!)
“The Secrets of Thinking: Tim’s Journey into the Kingdom of the Brain” (It turns out that every single cell in our brain is quietly working hard to help us grow!)
“The Invisible Microbes: Tim’s Journey into the Kingdom of Bacteria” (It turns out there are so many health secrets hidden in the unseen world!)

Little Tim has run into a strange problem—his appetite has suddenly vanished! Not even his favorite dishes, like juicy meat patties, nutritious vegetables, or even pasta, can pique his interest. Where on earth has his hunger gone? With this question in mind, Tim embarks on a magical adventure inside his own body.
Accompanied by the knowledgeable Dr. Metabolism and his inseparable companion, a little dog named Avocado, Tim shrinks down and enters his metabolic system. They journey through the mouth, stomach, and intestines, witnessing firsthand how food is broken down, how nutrients are absorbed, and how cells carry out their work. Along the way, Tim not only discovers the cause of his lost appetite but also learns the secrets of healthy eating. It turns out that behind every bite lies a bustling, fascinating world happening at the microscopic level!
This book introduces children to the principles of healthy eating and the process of metabolism. Created with the assistance of nutritionists and written in an engaging, inquiry-based style, it allows young readers to absorb scientific knowledge in an accessible way as they follow the adventures of the story’s characters.

[Author] Maria Gennadyevna Kosovskaya (1979) is a Russian writer and screenwriter. She has published three collections of prose and co-authored three non-fiction books for children. She is a member of the Russian Writers’ Union. Born in Moscow in 1979, she spent her childhood in the city of Venyov in Tula Oblast. She holds a first degree from the Moscow State Mining University and a second degree from the Prose Department of the M. Gorky Literary Institute, where she studied under Vladimir Vladimirovich Orlov and Alexander Alexandrovich Mikhailov. She also participated in the “Belkin Stories” creative workshop led by Alexander Konstantinovich Antonov.
2019 — Received a diploma at the 17th Voloshin International Prose Competition for the story “Barbie.”
2020 — Won the prose prize at the S. N. Sergeev-Tsensky Literary Contest for the short story “The Box.”
2021 — The short story “Kozlikha” was shortlisted for the Fazil Iskander Prize in the “Tree of Childhood” category.
2023 — Was awarded the 20th Voloshin International Literary Prize in the “Prose” category for the short story “Aunt Zhenya.”
2023 — Took third place at the Ignaty Rogozhnikov Short Prose Competition for the short story “The Bird.”
2023 — Received the L. M. Leonov Prize, being nominated for the “Young Prose Writer” award for the short story “The Madman on the Metro” (No. 12, 2023).

- Appetite is gone
- What is hunger?
- Why do our bodies have needs, and why do our brains have reflexes?
- The wise hypothalamus
- Energy balance
- Nutritional science
- Meeting Dr. Metabolism
- The factory
- The sun and the energy of metabolism
- The evolution of humans and human food
- Metabolic scanner
- Nutrition school
- The first suspects
- Proteins
- Functions of proteins
- Carbohydrates
- Why we love sweets
- Meeting fats
- In the obesity classroom
- The benefits of fat
- Beware! Fat transformation!
- Probiotics
- The vitamin social circle
- The minerals museum
- Balancing nutrients
- The rhythm of life
- A journey inside the cell
- Cellular respiration
- The membrane
- The power plant
- The power has run out
- The insulin seesaw
- The protein factory
- The guardian barrier, damage alert!
- Vitamin deficiency
- The nucleus
- Body cells are like a team
- Fast food
- Obesity
- The fitness center
- Proper nutrition
- Changing eating habits
- At the supermarket
- The big reveal
- Anti-sugar vegetables
- Long live a good appetite!