Spiders Use Electricity to Fly

For centuries, observers like Charles Darwin were baffled to find tiny, wingless spiders miles out at sea, seemingly floating through the air. The long-held belief was that spiders achieved this "ballooning" by simply catching a ride on the wind with their silk. While wind is a factor, it couldn't explain how spiders can launch themselves into the sky on perfectly still days. The true secret to their flight lies in a force they can sense and harness: static electricity.

The Earth maintains a natural atmospheric potential gradient, meaning the ground has a negative electric charge while the air above holds a positive charge. When a spider is ready to travel, it often raises a leg to test these electric fields. It then releases strands of negatively charged silk. Just as two negative ends of a magnet push each other away, the negatively charged silk is repelled by the negatively charged surface the spider is standing on. This electrostatic force is strong enough to lift the tiny arachnid skyward, launching it on journeys that can span hundreds of miles and reach incredible altitudes, allowing them to colonize new and distant territories.