ELI5: Explain Like I'm 5

F-theory

F-theory is a type of string theory. String theory is a complicated idea about what lies beneath the surface of our universe. F-theory is a special kind of string theory that suggests that the universe is made up of tiny strings that vibrate at different frequencies. These strings interact with each other and with the particles they make up the universe. The idea is that the universe is actually composed of higher dimensional structures that can only be understood using mathematics. F-theory is often used to explain new phenomena in physics, like black holes and dark matter.
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