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This glowing particle in a laser trap may reveal how lightning begins

Using a precisely aligned pair of laser beams, scientists can now hold a single aerosol particle in place and monitor how it charges up. The particle’s glow signals each step in its changing electrical state, revealing how electrons are kicked away and how the particle sometimes releases sudden bursts of charge. These behaviors mirror what may be happening inside storm clouds. The technique could help explain how lightning gets its initial spark.

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