In the Star Trek universe, handheld medical tricorders became standard issue for Starfleet vessels as early as the mid-22nd century. Here in a little place we like to call “reality,” a competition seeks to help deliver such all-in-one health analyzers at least 100 years ahead of schedule. After more than 300 prospective entrants for the Qualcomm Tricorder XPRIZE expressed interest in the competition, organizers on Tuesday will unveil the 34 teams competing for the $10 million prize.