Imagine you have a huge book filled with all sorts of information about everything in the world. This book is so big that it would take you a really long time to read all of it. That's kind of what the International Encyclopedia of Unified Science is like!
The Encyclopedia is a collection of articles written by really smart people who know a lot about different fields, like biology, psychology, and physics. They've all gotten together to write about their specialties and how they relate to other fields.
This Encyclopedia is special because it's trying to bring all these different fields of science together in one big book. This way, instead of just reading about one thing, you can learn about how different things are connected to each other.
For example, if you were reading about biology, you might learn about how animals behave in different environments. But with the International Encyclopedia of Unified Science, you might also read about how physics helps us understand how animals move in their environments.
All in all, the Encyclopedia is trying to make it easier for people to understand how everything in the world is connected and works together. It's like a big puzzle, and this book is helping us put the pieces together!