When a Tyrannosaurus rex or other carnivorous dinosaur is depicted on screen, it roars like a carnivorous mammal. But birds developed from dinosaurs, so could they have screeched or called like the modern cassowary, or made no noise at all?
Andrew Johnson, Banbury, Oxfordshire, UK
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When I drain a can of chickpeas, the liquid forms a soapy foam. What causes this, and if it is related to soap, could it be used as an eco-friendly replacement?
John Munroe, Edinburgh, UK
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