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Lightning protection systems. Lightning can easily damage a number of different building materials, and the large electrical currents can cause fires within the interior or even side flashes. Side flashes are small explosions of highly pressurized, super-heated air that occur inside the nooks and crannies of structure materials.
In a thunderstorm, the safest place to be is inside a large building equipped with lightning rods. A vehicle such as a car provides complete protection by surrounding you with metal, which will conduct the lightning's charge safely to the ground. But it you are caught outside, don't stand under a tree.