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Why doesn’t a nuclear bomb create a chain reaction that destroys the entire planet?

  Because real life is not Hollywood plus 4 reasons. Fission vs. Fusion : Nuclear bombs work on the principle of nuclear fission – splitting heavy atoms like uranium or plutonium. This releases energy, sure, but to destroy the entire planet? Not enough oomph. What you'd need is a fusion reaction, the kind that fuels stars. That involves lighter atoms like hydrogen fusing, and it's way more powerful. Think of fission as a firecracker, fusion as the sun. We're nowhere near making a fusion bomb as big as our planet. The Limits of Chain Reactions : Even in a fission bomb, the chain reaction doesn't run wild forever. The explosion itself scatters the nuclear fuel, disrupting the critical mass needed to sustain the reaction. It's like trying to keep a bonfire going by throwing the logs across the field. Dissipation of Energy : The colossal energy released by a nuke mostly disperses as heat, light, and a shockwave. Earth is just way too big to absorb all that and go kabloo...
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Where is the end/last corner of earth?

 Earth is 2-sphere and not a disk and thus has no end/last corner, cause a 2-sphere has no boundary. Therefore, the notion of an "end" or "last corner" of the Earth is subjective and depends on the perspective one adopts. From a geographical standpoint, the Earth is a spherical shape, and there is no specific point that can be considered the absolute end or last corner. Continents, islands, and landmasses extend across the planet, interconnected by vast oceans. However, if we consider the extreme points of the Earth's surface, we can identify certain locations. For example, the southernmost point is generally considered to be the geographic South Pole, while the northernmost point is the geographic North Pole. Similarly, the westernmost and easternmost points are located at opposite sides of the globe, encompassing various landmasses and islands. It is important to remember that the Earth is a dynamic and interconnected system, and the concept of an "end" is more philosophical than a specific physical location.

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