Market studies suggest space tourism-a rubbernecker's trip to earth orbit-is likely to draw 50,000 passengers a year if the ticket can be pushed below $25,000. That's what tens of thousands of people spend each year on competing trips, such as round-the-world cruises on luxury liners and adventure tours to Antarctica or Mount Everest.

Even before the agricultural revolution began in the Fertile Crescent about 10,000 years ago, humans had learned how to work with new technology. Those who could not or would not eventually became priests, politicians, and bureaucrats.

Initially, the laser was called an invention looking for a job.

Market studies suggest space tourism-a rubbernecker's trip to earth orbit-is likely to draw 50,000 passengers a year if the ticket can be pushed below $25,000. That's what tens of thousands of people spend each year on competing trips, such as round-the-world cruises on luxury liners and adventure tours to Antarctica or Mount Everest.