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restore dark energy paragraph, with qualification that it is a hypothesis
Some string theorists, such as Leonard Susskind, say that string theory may not be testable but may still provide insights on multiple universes. But his book defending string theory appears by its title to be a rant against [[Intelligent Design]]: "''The Cosmic Landscape: String Theory and the Illusion of Intelligent Design.''"
Some string theorists, such as Leonard Susskind, say that string theory may not be testable but may still provide insights on multiple universes. But his book defending string theory appears by its title to be a rant against [[Intelligent Design]]: "''The Cosmic Landscape: String Theory and the Illusion of Intelligent Design.''"
== Dark Energy Confounds String Theory ==
The discovery of data supporting an accelerating expansion of the universe, and the accompanying [[dark energy]] hypothesis, in 1998 was a particularly damaging blow to string theory. It was just the sort of thing that string theorists hoped to explain, and yet string theory cannot explain it. As of today, string theory has attracted strong interest among theorists but has not suggested any critical experiments.
==Mathematical Predictions==
==Mathematical Predictions==