Trivia: During the phone call between Kathrine and Professor, we can see the roof of laboratory. It is made of ordinary aluminium or plastic blocks, like roofs in offices. This kind of roof can transport air. Persons behind glass are doing something with danger microbes and they are in protective suits. Professor and his assistants, before glass, don't wear that suit, but the holes in roof can transfer microbes to their part of the laboratory.
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