Floating in this miniature lake are tens of thousands of micro-organisms.They take on many forms – viruses the size of tennis balls float around you aimlessly, others like the Euglena oxyuris cells which pass you like freight trains.

在这迷你湖里漂浮着成千上万的微生物，它们以许多形式存在：像网球般大的病毒毫无方向地漂浮，其他如眼虫这样的生物像货运火车般呼啸而过。