It's not accurate to say there are just four main branches of science. There are many different ways to categorize science, and the number of branches depends on the level of detail. However, a common and helpful way to think about science is to divide it into two major categories:

1. Natural Sciences:

* Focus: The study of the natural world, including its properties and laws.

* Branches:

* Biology: The study of life and living organisms, including their structure, function, growth, origin, evolution, and distribution.

* Chemistry: The study of matter and its properties, as well as how matter changes.

* Physics: The study of matter, energy, motion, and force.

* Earth Science (or Geology): The study of the Earth's physical structure, history, and processes. This includes geology, meteorology, oceanography, and astronomy.

2. Social Sciences:

* Focus: The study of human society and its interactions.

* Branches:

* Anthropology: The study of human societies and their cultures, including their origins, development, and variations.

* Economics: The study of how people make decisions about scarce resources.

* Political Science: The study of government, power, and politics.

* Psychology: The study of the mind, behavior, and mental processes.

* Sociology: The study of human social relationships and institutions.

Beyond these two main categories, there are also other fields of science, such as:

* Formal Sciences: These deal with abstract systems, such as logic, mathematics, and computer science.

* Applied Sciences: These use scientific knowledge to solve practical problems, such as engineering, medicine, and agriculture.

It's important to remember that these categories are not always clear-cut. Many branches of science overlap, and new fields are constantly emerging. The way we organize science can change over time and for different purposes.