In the May 2003 issue, POPULAR SCIENCE showcased several of the groups vying for the X Prize, a $10 million award that will go to the first privately financed team that manages to launch a manned spacecraft to an altitude of 62.5 miles, then repeat the feat within two weeks. X Prize founder Peter Diamandis doesn't expect all of the 24 contenders to produce a finished craft, much less succeed. Their engineering approaches range widely, from runway takeoffs to balloon launches. Here are the plans of a few of the teams that received little or no mention in the original article.