I don't know who vault boy is, but that doesn't make any sense, the mushroom cloud comes in the wake of the explosion, so if you're alive to see it, then you must have been at a safe distance.Hastur wrote:I was told the origin of the vault boy in fallout doing the thing with his thumb was that children were taught that if the thumb covered the mushroom cloud they were at a safe distance from the blast. Any truth to that?
The mushroom cloud is just the burning debris rising into the air, the explosion itself, looks like this;