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Published 16:47 9 Aug 2015 BST

4. Water is good for healthy nails
5. Stress can prevent growth (which means you should take more afternoons off for manicures)
6. Nail-biting is the most common nervous habit (and it’s called onychophagia)
7. Nails grown faster in summer than winter
8. Having your nails polished all the time is bad for them (it dries them out and weakens them)
9. The middle fingernail grows fastest, the thumbnail grows slowest

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