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Who Invented the Compass?

In short: The compass was invented in China; there is no single inventor. The first magnetic direction finders were lodestone “sinan” spoons of the Han dynasty (about 2nd century BC – 1st century AD), used for divination. The magnetised-needle compass…

Why is the sky blue: Rayleigh scattering diagram

Why Is the Sky Blue? Rayleigh Scattering Explained

In short: The sky is blue because sunlight is scattered by the nitrogen and oxygen molecules in the atmosphere. This is called Rayleigh scattering: short-wavelength blue light is scattered about 5–6 times more than long-wavelength red light, so blue light…

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