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Emily Thomas tests The Food Chain Quiz panel on their water footprint knowledge. How much water do you think it takes to produce an egg or one orange? The answers may just surprise you. On The Food Chain quiz panel: Â鶹Éç technology correspondent Rory Cellan-Jones; Â鶹Éç Radio 4 correspondent Matthew Price; Jozef Youssef, chef and founder of Kitchen Theory in London; and Â鶹Éç World Service presenter Jackie Leonard. (Image: Drops of falling water. Credit: Yasuhiro Nakajima/ Getty Images)