In the most physical sciences data is collected from a system to produce a model
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A theory of everything (ToE) or final theory is a putative theory of theoretical physics that fully explains and links together all known physical phenomena, and predicts the outcome of any experiment that could be carried out in principle.[1] The term mainly refers to the desire to reconcile the two main successful physical frameworks, general relativity which describes gravity and the large-scale structure of spacetime, and quantum field theory, particularly as implemented in the standard model, which describes the small-scale structure of matter while incorporating the other three non-gravitational forces, the weak, strong and electromagnetic interactions.
A primary stumbling block in the construction of a ToE is that straightforward attempts to apply quantum mechanics to the gravitational field, in the same way as for say the electromagnetic field, fails due to the breakdown of the renormalization procedure. Thus the central issue is how to combine general relativity and quantum mechanics. This is one of the unsolved problems in physics.
Many candidate theories of everything have been proposed by theoretical physicists during the twentieth century, but none have been confirmed experimentally.
Initially, the term 'theory of everything' was used with an ironic connotation to refer to various overgeneralized theories. For example, a great-grandfather of Ijon Tichy %u2014 a character from a cycle of Stanis%u0142aw Lem's science fiction stories of the 1960s %u2014 was known to work on the "General Theory of Everything". Physicist John Ellis[2] claims to have introduced the term into the technical literature in an article in Nature in 1986.[3] Over time, the term stuck in popularizations of theoretical physics research.
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