Ancient humans built a bridge inside a cave on Mallorca nearly 6,000 years ago
By Ashley Strickland, CNN (CNN) — An ancient, submerged bridge in a cave on the Spanish island of Mallorca is helping researchers determine when humans first settled on islands across the western Mediterranean Sea thousands of years ago. A new analysis of the 25-foot-long (7.6-meter-long) bridge inside Genovesa Cave has revealed that humans lived on
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