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String theory attempts to unify general relativity and quantum theory. Popular in the 1990s, string theory fell out of favor as it failed to provide testable predictions and required ten dimensions ...

Terry Lane is a writer for Investopedia with 25 years of experience in journalism and communications. He covers personal finance, Congress, government regulations, and economics. Investopedia / Alice ...

SpaceX notified investors that it is executing a 5-for-1 stock split, a move that will reduce the price investors will pay for each share offered in its impending initial public offering. Shareholders ...