14 April 2011 Last updated at 09:26 GMT
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To coincide with the 50th anniversary of the first manned spaceflight, BBC News presents a guide to the International Space Station (ISS), the biggest orbiting platform ever built for humans. The ISS began operating as a giant orbiting research laboratory in November 2000, when the first crew took up residence. Many countries have contributed components to the ISS, which is supposed to be completed some time in 2012 and to remain in operation for at least another three years.
Stale beer's chemistry examined
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