In any age, there is no shortage of people willing to embark on a hazardous adventure. Columbus and Magellan filled eight ships between them for voyages into the void. One hundred and fifty years ago, the possibilities offered by missionary service were limitless and first-rate. Later, Scott and Shackleton turned away droves after filling their crews for their desperate Antarctic voyages. In 1959 ... sailor H.W. Tilman, looking for a crew for a voyage in an old wooden yacht to the Southern Ocean, ran this ad in the London Times: "Hand [man] wanted for long voyage in small boat. No pay, no prospects, not much pleasure." Tilman received more replies than he could investigate, one from as far away as Saigon.