cropcircles_img_5224_jpg

Published February 23, 2015 at 600 × 436 in cropcircles_img_5224_jpg
The clean circle on the ship's hull designates where the researchers have collected samples of the biofilms. (Photo by Ian Davidson)

The clean circle on the ship’s hull designates where the researchers have collected samples of the biofilms. (Photo by Ian Davidson)

The clean circle on the ship’s hull designates where the researchers have collected samples of the biofilms. (Photo by Ian Davidson)

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