Add plus FIREBALL for a fun way to boost your chances to win! If you add plus FIREBALL, your wager amount is doubled for each game you play! Play plus FIREBALL for only the cost of your original base wager (for example: if your original base wager is $0.50, the cost of plus FIREBALL will be $0.50).
1 Fretting corrosion is primarily a surface damage phenomenon occurring as a result of small cyclic movements between two materials caused by cyclic loading. Fretting damage can occur in vacuum, although it then would be better to speak of fretting, rather than fretting corrosion.
What causes elbows, knees and certain areas of body skin to darken? One of the most common causes of darkened skin in these areas is contact or photocontact dermatitis. Contact dermatitis occurs when the skin is irritated by its contact with irritants or allergens. Photocontact dermatitis occurs when those irritants are stimulated by light (many allergens, such as fragrances, dyes and preservatives, are also photo-allergens, which can react with light to cause darkening).