[:en]Leading Change and the Refraction Layer[:ja]変化と屈折層[:]

[:en]My father used to help people who set off explosions on the surface of the Earth. No, this was not for blowing things up. It is what is called “non-destructive testing” in hunting for oil. With the right kinds of sensors on the Earth’s surface and some sophisticated math, you can develop a image of […]

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