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As US president Barack Obama visits Myanmar, we ask if Washington has eased sanctions too much too early, while the Burmese government has failed to deliver on reforms. Also, European scientists land a robot on a comet millions of miles into space - we look at whether asteroids and comets can be exploited for minerals, and the commercial viability of mining in space. Plus, we look at the strange, morally complex world of foreign exchange dealers. We discuss all this with Alison van Diggelen, host of radio programme Fresh Dialogues in San Francisco and Heather Timmons, Asia Correspondent for Quartz in Hong Kong.