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What is the fundamental nature of reality? Are there fundamental building blocks of the universe, and if so, what are they? Questions about the ultimate constituents of reality and the nature of existence fall under this category.

1. Why is the sky blue?

1. What is the coldest place on Earth?

What is the melting point of NH2NH3Cl

Are human actions predetermined by factors such as genetics and environment, or do individuals possess genuine free will? This question delves into the idea of whether our actions are purely determined or if we have the capacity for autonomous decision-making.

What caused the universe to exist? Questions about the origin of the cosmos, the Big Bang theory, and what, if anything, existed before the universe are areas of ongoing inquiry.