The Real Science Behind Why Mass Creates Gravity | Feynman

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Much more detail on the same thing:

He mentions chess playing and weather analogies. Start from the 22 minute point below.

The Equation That Runs The Universe — And Why You Were Never Taught It

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That is in addition to what we call "chaos theory" that relates to tiny changes in the initial conditions that amplify with time.

Chaos theory is a branch of mathematics and an interdisciplinary area of scientific study. It focuses on underlying patterns and deterministic laws of dynamical systems that are highly sensitive to initial conditions. These were once thought to have completely random states of disorder and irregularities.^[1] The theory states that within the apparent randomness of chaotic complex systems, there are underlying patterns, interconnection, constant feedback loops, repetition, self-similarity, fractals and self-organization.^[2] The butterfly effect, an underlying principle of chaos, describes how a small change in one state of a deterministic nonlinear system can result in large differences in a later state (meaning there is sensitive dependence on initial conditions).^[3] A metaphor for this behavior is that a butterfly flapping its wings in Brazil can cause or prevent a tornado in Texas

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What does the butterfly effect have to do with weather forecasts?