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Singularity

Penrose–Hawking singularity theorems in general relativity attempt to answer the question of when gravitation produces singularities.

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Evolution

That organisms have descended with modifications from common ancestors is not a theory. It is a fact, as fully as the fact of the earth's revolution about the sun.

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Relativity

Special relativity is mathematically self-consistent, and a part of all modern physical theories, most notably quantum field theory and general relativity.