The phenomenon of "flying" spiders gliding into the air and traveling like balloons for hundreds of miles (kilometers) has a new possible explanation: the air's natural electric charge. Aerial spider journeys -- often known as "ballooning" -- have long been observed, notably by biologist Charles Darwin, who documented the spectacle in his diary in the 19th century. One closely studied hypothesis suggested that spiders weave very fine silk threads that catch in the wind and whisk them aloft, sometimes over great distances at high altitudes.
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