A 34-Step Guide To String Theory, As Explained By Cats

Now it all makes sense.

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1. When you jump into the air, you fall back to the ground. Because gravity.

Isaac Newton first described the force of gravity. But he couldn't really explain how it worked.

2. Matter bends space, and that's how gravity is transmitted.

It was Albert Einstein who worked this out, several centuries after Newton's discovery.

With thanks to this talk by Brian Greene and whystringtheory.com.

More on Kaluza and Klein's extra dimension here, and how that applies to string theory's ten dimensions.