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The Problem With Quantum Gravity
When people thought about this hypothesis that the world was made of strings rather than particles, they kept running into the puzzle. It kept predicting a spin-to particle in particular, which has all the properties of the graviton. So eventually, they realized, well, look, gravity exists. Let's just take it seriously as a theory of gravity. And one of the reasons why it was not that popular is because, well, very few people were thinking about quantum gravity.