Carved from sharp volcanic rock and more than 700 years old, the stone formations can weigh upwards of 13 tons. Archaeologists have long wondered how these stone hats, which sit atop the heads of the famous Easter Island statues, were put into place with 13th-century technology... Rapa Nui, or Easter Island, rises from the waves about 2,000 miles from Chile. The island's famous statues have been studied by various teams of archaeologists and geologists since the 18th century. Previous studies determined that the statues are made of from one quarry on the island, while the hats come from a different...