Two Hawai’i students who met as dueling eighth-graders in the National Spelling Bee five years ago are working together as Massachusetts college students to grow vegetables on Mars. For the past few months, Cheryl Inouye and Nicole Hori have been on a team of students from the Olin College of Engineering in Massachusetts, wrestling with how to set up a functional, automated greenhouse to provide fresh salad for future astronauts on the Red Planet. It’s part of a national NASA competition that asked college engineering students across the country to submit designs for a greenhouse in space that would function for 20 years.