Many theories are rock-solid: Scientists have just as much confidence in the theories of relativity, quantum mechanics, ...

A new Big Bang model does away with speculative elements, putting gravitational waves at the forefront of the creation of ...

It may seem that, by calling it "string theory" and presenting it as a possible solution to a scientific question, we've already answered in the affirmative: yes, string theory is a scientific theory.

For a theory to be scientific its predictions must also have a reasonable chance to accurately describe reality. Construing up one of an infinite number of multiverse variants has no reasonable ...

Writing about the drama of a new scientific theory—one with potentially big implications for the future—had given Friedan the courage to write about complex research and the ways it affects ...

Researchers say they discovered evidence that early Earth was home to more hydrogen than previously thought, calling into question widely held beliefs about the origins of water and the planet’s ...