In his lab, there is plenty more urine swilling around – in vats, funnels and hoses. Most of the urine is artificial – mixed so the scientists know the exact chemical composition for their experiments – but some comes from human volunteers. The walls are lined with grey plastic drain pipes, attached to plastic boxes full of bubbling artificial urine. At the centre of the room, larger terracotta-coloured pipes rise from plastic barrels of urine.
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