The Week and its Seven Days. A year roughly adds up to 52 weeks of seven days, but countries vary on exactly how they count and number the weeks.The seven-day week is the international standard week (ISO 8601) used by the majority of the world.Calendars help keep track of the days. year roughly adds up to 52 weeks of seven days, but countries vary on exactly how they count and number the weeks. The seven-day week is the international standard week (ISO 8601) used by the majority of the world. Calendars help keep track of the days.
Toenails also develop a white appearance due to damage from toenail polish and toenail polish remover. Most nail polish have chemicals, such as formaldehyde and toluene, that dry and damage the toenails. Nail polish remover also has chemicals, such as acetone, that does the same.
Fungus infections of the fingernails can also turn the nails brown or yellow. The texture usually also changes; nails often become very thick and may crack or peel. Nail fungus infections are more common in the toes than the fingers. They affect about 12 percent of Americans and may run in families.