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Scientists have been dissecting the human body for centuries – yet researchers in the Netherlands have appeared to discover an organ new to medical science: a fourth pair of salivary glands deep inside our heads. Matthijs Valstar and Wouter Vogel talk us through the discovery and oncologist Yvonne Mowery explains the implications this has on the way patients with head and neck cancer undergo radiation treatment. (Image: Close up of middle of a woman's face, Credit: Getty Images.)