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Top Questions
39
votes
Why do we use helium in balloons?
elements
hydrogen
density
noble-gases
asked Sep 8, 2014 at 8:45
chemistry.stackexchange.com
11
votes
Is there a state beyond gas?
states-of-matter
asked Nov 11, 2014 at 8:47
physics.stackexchange.com
5
votes
Is there an astronomy exam I can take?
education
asked Sep 12, 2014 at 14:33
astronomy.stackexchange.com
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