Albert Einstein spent the last 30 years of his life pursing a “theory of everything,” aiming to find a concise equation summarizing the fundamental laws of the Universe. His downfall? Subatomic particles.

Physicist Michio Kaku offers an alternative to Einstein’s elusive theory: “string theory.” We could try to explain it, but he does a much better job. After all, he’s one of the co-inventors of it.

If you aren’t sold on string theory, Kaku breaks down the three criteria needed to figure out what makes our Universe tick: it must incorporate Einstein’s theory of gravity, explain particle physics, and be mathematically sound. No pressure.

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