Restless Genes


The compulsion to see what lies beyond that far ridge or that ocean—or this planet—is a defining part of human identity and success.

In the winter of 1769, the British explorer Captain James Cook, early into his first voyage across the Pacific, received from a Polynesian priest named Tupaia an astonishing gift—a map, the first that any European had ever encountered showing all the major islands of the South Pacific. Some accounts say Tupaia sketched the map on paper; others that he described it in words. What’s certain is that this map instantly gave Cook a far more complete picture of the South Pacific than any other European possessed. It showed every major island group in an area some 3,000 miles across, from the Marquesas west to Fiji. It matched what Cook had already seen, and showed much he hadn’t.

Cook had granted Tupaia a berth on the Endeavour in Tahiti. Soon after that, the Polynesian wowed the crew by navigating to an island unknown to Cook, some 300 miles south, without ever consulting compass, chart, clock, or sextant. In the weeks that followed, as he helped guide the Endeavour from one archipelago to another, Tupaia amazed the sailors by pointing on request, at any time, day or night, cloudy or clear, precisely toward Tahiti.

Cook, uniquely among European explorers, understood what Tupaia’s feats meant. The islanders scattered across the South Pacific were one people, who long ago, probably before Britain was Britain, had explored, settled, and mapped this vast ocean without any of the navigational tools that Cook found essential—and had carried the map solely in their heads ever since.

Two centuries later a global network of geneticists analyzing DNA bread-crumb trails of modern human migration would prove Cook right: Tupaia’s ancestors had colonized the Pacific 2,300 years before. Their improbable migration across the Pacific continued a long eastward march that had begun in Africa 70,000 to 50,000 years earlier. Cook’s journey, meanwhile, continued a westward movement started by his own ancestors, who had left Africa around the same time Tupaia’s ancestors had. In meeting each other, Cook and Tupaia closed the circle, completing a journey their forebears had begun together, so many millennia before.

Cook died in a bloody skirmish with Hawaiians ten years later. (The Hawaiians snatched a boat; Cook lost his temper and fired upon them; although he killed one and his crew killed several others, the Hawaiians caught him in the surf and stabbed him to death.) His death, some say, brought to a close what Western historians call the age of exploration. Yet it hardly ended our exploring. We have remained obsessed with filling in the Earth’s maps; reaching its farthest poles, highest peaks, and deepest trenches; sailing to its every corner and then flying off the planet entirely. With the NASA rover Curiosity now stirring us all as it explores Mars, the United States, along with other countries and several private companies, is preparing to send humans to the red planet as well. Some visionaries even talk of sending a spacecraft to the nearest star. (See “Crazy Far.”)

Written By: David Dobbs
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  1. Fascinating article.

    I think I’ll write a book on genes that have hitched a ride across space/time through ‘running away’.


  2. That would be genetic drift , hitch hiking is the natural selection of an advantageous allele 🙂

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