On this week's Issues & Ideas: A unique spacecraft is now orbiting the earth and soon a team at Cal Poly in San Luis Obispo will command it to unfurl a super-thin Mylar sail. The craft will then glide through space, propelled only by sunlight. We talk to the mission's project manager to learn more. Also, there was a recent change of command ceremony at Army Reserve Garrison Fort Hunter Liggett in Monterey County. We hear from both the outgoing and incoming commanders.