International Space Station is an orbital turkey

Nobel Laureate Disses NASA's Manned Spaceflight -- SPACE.com
""Human beings don't serve any useful function in space," Weinberg told SPACE.com. "They radiate heat, they're very expensive to keep alive and unlike robotic missions, they have a natural desire to come back, so that anything involving human beings is enormously expensive.""
http://www.space.com/news/070918_weinberg_critique.html

I love ISS, but his opinion might not be wrong, in fact.
確かに　そういう一面はある