The house technicians at Ozeaneum Stralsund use a vacuum cleaner on the 15-meter-long sperm whale and the 10-meter-long giant squid in the exhibition hall showing “Giants of the Sea 1:1”, in Stralsund, Germany, 13 January 2015. Since the last cleanup, a two-millimeter thick dust layer has formed on the surface of the sperm whale. (Photo by Stefan Sauer/EPA)
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