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### 5. String Theory

The **theory** that extremely small strings, even smaller than quarks, make up *everything*. These strings vibrate differently, like different notes in a song, and that's what makes different particles. These little tiny strings would make the math work out so that General Relativity could be combined with Quantum Mechanics.

In summary, there are Four Fundamental Forces that control our universe: some on a giant scale and some on a tiny scale. Scientists have searched long and hard to find a way to unify these forces with one master equation. So far, electromagnetism, small nuclear force, and weak nuclear force can be described with Quantum Mechanics, and gravity can be described using General Relativity. The one problem is that the math for Quantum Mechanics and General Relativity doesn't match up. That's where String Theory applies. If there was an explanation for gravity, say mass-less particles made up by tiny strings, these categories of modern physics could be unified.

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