Unifies both special relativity and gravity.
Not compatible with the Standard Model, and the 2020 unification attempts are called theory of everything.
One of the main motivations for it was likely having forces not be instantaneous, but rather mediated by field to maintain the principle of locality, just like electromagnetism did earlier.
Subtle is the Lord by Abraham Pais (1982) page 22 mentions that when Einstein saw this in 1915, he was so excited he couldn't work for three days.
Combination of electromagnetism and general relativity. Unlike combining quantum mechanics and general relativity, this combination was easier.
TODO any experiments of interest at all?
In 2020 physics, best explained by general relativity.
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General relativity is a fundamental theory of gravitation formulated by Albert Einstein, published in 1915. It extends the principles of special relativity and provides a new understanding of gravity, not as a force in the traditional sense, but as the curvature of spacetime caused by mass and energy. Key concepts in general relativity include: 1. **Spacetime**: Instead of treating space and time as separate entities, general relativity combines them into a four-dimensional continuum known as spacetime.