In the summer of 1985, a mostly Hawaiian crew set out aboard Hokule'a, a reconstructed ancient double canoe, to demonstrate what skeptics had steadfastly denied: that their ancestors, sailing in such canoes and navigating solely by reading stars, ocean swells, and other natural signs, could intentionally have sailed across the Pacific, exploring the vast oceanic realm of Polynesia and discovering and settling all its inhabitable islands. Their round-trip odyssey from Hawai'i to Aotearoa (New Zealand), across 12,000 nautical miles, dramatically refuted all theories declaring...