Shutterstock/Martin Mecnarowski
Why didn’t green fur evolve among mammals, when there are birds with green plumage and reptiles with green skin?
Marc Russo,
Brooklyn, New York, US
Jacob Lund/Shutterstock Source: Shutterstock
When I look for ice cubes for an evening gin and tonic, I often find they have shattered in the mould. What causes this?
John Neimer,
Stoborough, Dorset, UK
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