Probability: 1.0
Justification: All the provided evidence confirms that the United States consists of 50 states. This information is consistently supported across multiple sources, including official government documents and reputable encyclopedias.
Final Truth Score: 0.93
Probability: 0.0
Justification: The claim "The world is flat" is not supported by any credible scientific evidence. All the provided evidence discusses the book "The World Is Flat" by Thomas L. Friedman, which is about globalization and its impact on the world, not about the physical shape of the Earth. The Earth is widely accepted by the scientific community to be an oblate spheroid, meaning it is roughly spherical in shape but slightly flattened at the poles and bulging at the equator.
Final Truth Score: 0.34