Today we ran across this NASA photo from @Cmdr_Hadfield in Houston, Texas, whose Twitter profile reads: "Mission specialist on STS-74 and performed multiple EVAs on STS-100. Currently training as the commander of Expedition 35." Here he tweets: "NASA's hyperbaric chamber—in case of bubbles in our blood after a long dive. Ready to save a life." Learn more about Commander Chris Hadfield on the Canadian Space Agency website. He's off to the International Space Station via Soyuz rocket in November 2012.