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Aftershocks are earthquakes on a smaller scale after the main quake. They happen because the newly moved rock have to be settled. Aftershocks are dangerous because they are usually unpredictable, can be of a large magnitude, and catch people offguard if they are salvaging items from a damaged building.

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Fibonacci number

... recursively by the following equations: F(0) = 0 F(1) = 1 F(n + 2) = F(n) + F(n + 1) for all n ≥ 0. In words: you start with two ones, and then produce ...