Exploring slate mines in north Wales, UK, my son and I often find structures that resemble a mussel or similar bivalve on rusting iron metalwork. What鈥檚 going on?
John Rowlands, Anglesey, UK
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听
Do menthol nasal decongestants still work if you can鈥檛 smell them?
Alison Manson, Forres, Moray, UK
听
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