smoking
dirt
The deep *vertical* lines in your fingernails are genetic. If you have *horizontal* ridges in your nails, you should see a doctor.
picking warts on your bum and casual worms.
Keratin... it's a natural substance that makes the nail harden.
Fingernails are normal in the human body. Please be more specific in your question.
Elizabeth Barrett Browning was a strong advocate for social justice causes, such as the abolition of slavery and women's rights. She also supported the Italian unification movement and wrote poems expressing her support for these causes.
The white area in fingernails and hair are caused by air. That's why snow is white and not blue. Little bumps and bruises that are done to the bed of the nail cause these imperfections.
Yes, fingernails are distal to the wrist. The wrist is considered proximal to the fingernails.
Metal fatigue
Some premature babies get dark colored or black fingernails because of the lack of fat under the skin which causes the skin to discolor. This can also be due to a lowered amount of oxygen in the extremities shortly after birth.
penta-fingernails