feedback needed on TEDx talk

The part saying that Mars colonists would have to live underground is nottrue. There could be domes with water inside the dome surface and/oratmosphere if deep enough. I'd edit that out. This may sound like a minorpoint, but the speech is to young adults and honesty is important.In its place I would mention, presented in a rather dramatic fashion for thehigh schoolers, the ever-present gravity wells around any planet or moon,and how not having these around is a pointed advantage.