The Metal Path That Guides Lightning Down
Look at the roof of a tall building and you may spot a thin metal rod pointing at the sky. Thick wire runs from it down the side of the building and into the ground. This is a lightning rod, and its job is to protect the building.
Lightning is a giant spark of electricity. It happens when electric charge builds up inside a storm cloud, and then it leaps toward the ground. A bolt takes the easiest path it can find. Wood, brick, and plaster are poor at carrying electricity, so a bolt that strikes them can heat them quickly and start a fire. Metal is excellent at carrying electricity. A bolt that hits a metal rod can flow along the thick wire and slip safely into the earth.
A lightning rod does not pull storms toward a building. It simply offers a safe road for the electricity if a strike happens. Benjamin Franklin, a scientist and inventor in the 1700s, was among the first to suggest the idea.
Rods protect buildings, but people need protection too. During a thunderstorm, the safest places are inside a sturdy building or a car with a hard top. Stay away from open fields and tall, lonely trees.