A theory of everything (TOE) is a hypothetical, singular, all-encompassing, coherent theoretical framework of physics that fully explains and links together all aspects of the universe. Finding a theory of everything is one of the major unsolved problems in physics.

A TOE would unify all the fundamental interactions of nature: gravitation, the strong interaction, the weak interaction, and electromagnetism. Because the weak interaction can transform elementary particles from one kind into another, the theory of everything should also predict all the various different kinds of particles possible.

Some of the most well-known TOE proposals include:

• String theory: String theory is a branch of theoretical physics that attempts to unify all the fundamental forces of nature in a single framework. In string theory, all matter and energy is made up of tiny vibrating strings.
• M-theory: M-theory is a hypothetical extension of string theory that is thought to be able to unify all possible string theories. M-theory is very complex and has not yet been fully developed.
• Loop quantum gravity: Loop quantum gravity is a theory of gravity that is based on the idea that space and time are quantized, meaning that they are made up of discrete units. Loop quantum gravity is still under development, but it has the potential to unify gravity with other fundamental forces.

It is important to note that no TOE has yet been fully developed or verified. However, the search for a TOE is one of the most important and exciting areas of research in physics today. A TOE would be a major breakthrough in our understanding of the universe and could lead to new technologies and insights into the fundamental nature of reality.

There is no single scientific theory that is universally considered to be the most inclusive. However, some theories that are often cited as being inclusive include:

• The Big Bang Theory in astronomy, which proposes that the universe began with a massive explosion and has been expanding ever since. This theory is inclusive because it does not rely on any specific assumptions about the origins of the universe, such as the existence of a creator or a divine being.
• The Cell Theory in biology, which states that all living things are made up of cells. This theory is inclusive because it applies to all living things, regardless of their size, shape, or complexity.
• The Theory of Evolution in biology, which proposes that all living things are descended from a common ancestor and have changed over time through a process of natural selection. This theory is inclusive because it does not discriminate against any particular group of organisms.
• The Germ Theory of Disease in medicine, which states that diseases are caused by microorganisms. This theory is inclusive because it applies to people of all ages, races, and socioeconomic backgrounds.
• The Atomic Theory in chemistry, which states that matter is made up of tiny particles called atoms. This theory is inclusive because it applies to all matter, regardless of its state (solid, liquid, or gas).
• The Kinetic Theory of Gases in chemistry, which states that gases are made up of tiny particles that are in constant motion. This theory is inclusive because it applies to all gases, regardless of their composition.

These are just a few examples of scientific theories that are often considered to be inclusive. Ultimately, the most inclusive scientific theory is one that is open to all people, regardless of their background or beliefs.