First-time astronaut Reid Wiseman arrived at the International Space Station two weeks ago, but zero gravity still surprises him. Tears don't run down your cheeks in space," wrote Wiseman, who is sharing his observations and pictures with a growing following on Twitter. "The way the clouds and the red desert met the ocean, it's burned in my mind," Wiseman said during an inflight interview with CBS News broadcast on Monday. Wiseman is one of six men living aboard the station, a $100 billion research laboratory that flies about 260 miles (418 km) above Earth.