It's as voyeuristic as Internet sex sites, more addictive than video games and a lot easier to play--and you can win big money! It's online investing, one of the hottest destinations in cyberspace. Ask Ardavan Arianpour of San Diego, Calif., who recently turned $1,000 into $5,000 through point-and-click trading. Arianpour is his own broker, trading as often as he likes and poring over online news, quotes and stock charts. "I just love researching and making money," says Arianpour, who has been piling up profits for retirement. That's still a long way off, though, because he is only 18.
The high school...