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Conrad Berube asked the Naked Scientists:Hello Chris:I have three questions:When I was boy (back when mastodons trod the earth) I remember getting little white lines across my fingernails which obviously started at the cuticles and eventually grew out towards the fingertips. It was probably my dad who told me that these were calcium deposits. It's many years since I remember having produced these even though I take regular calcium (with magnesium) supplements. Was my dad's nail tale correct?Conrad Bérubé What do you think?