How do onions still grow when kept in a fridge, with no warmth, soil or light? Stefania Pelfini, La Waziya Photography/Getty Images
Why do some veg, such as onions, carrots and radishes, continue to grow in the darkness of my refrigerator?
Jim Decandole, Toronto, Ontario, Canada
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How do astronomers decide where a galaxy begins and ends?
John Jarrett London, UK
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