Кристалл, Crystals
11-January-2015 Sunday
We grow crystals from copper sulfate: 1 month 2 weeks 1 day
12-December-2014 Friday
We grow crystals from copper sulfate: after 2 weeks
29-November-2014 Saturday
Growing crystals from copper sulphate
15-January-2014 Wednesday
? radioactive crystals and not so
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