In space, a cluster of health dangers

Space shuttle commander Christopher Ferguson and his crew took a small but crucial step for space travel in the past two weeks, enlarging the International Space Station so it can house six astronauts instead of three.

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<p><a href="http://www.physorg.com/news147367026.html">In space, a cluster of health dangers</a></p> <p>Space shuttle commander Christopher Ferguson and his crew took a small but crucial step for space travel in the past two weeks, enlarging the International Space Station so it can house six astronauts instead of three.</p>