科学素养与生活应用·英语30篇（1）

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闪电为何击中高物——却未必选择最高点

Lightning follows the path of least electrical resistance, not simply the shortest vertical distance to ground.
Tall structures create stronger electric fields that ionize surrounding air, making conductive pathways easier to form.
However, conductivity matters more than height: a wet tree may attract lightning more than a dry metal pole nearby.
Ground composition—like clay versus granite—affects where current flows once the strike connects.
Scientists measure 'step potential' differences to explain why animals spread out during storms avoid fatal currents.
Lightning rods work not by attracting strikes but by offering a safe, low-resistance channel to earth.
High-speed photography reveals that upward leaders from multiple points compete microseconds before final attachment.
Weather stations now combine electric field meters with 3D terrain mapping to forecast strike likelihood.
New models simulate how building shape and material influence leader initiation timing and direction.
Understanding this helps design safer infrastructure in mountainous or coastal regions prone to thunderstorms.