If you see a mushroom cloud from an atomic bomb, you´re supposed to stick your arm out and hold your thumb over the cloud. If the cloud is bigger than your thumb, you´re in the radiation zone and should evacuate. ♡

This is what vault boy is doing in the "Fallout" series.
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⠀⠀⠀⠀⠀this guide was made by ★ and ❤

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