A backfire is when the ignition of fuel doesn't take place in the ignition/combustion chamber, it(a backfire) can take place in the intake or exhaust. It can â¦ be caused by a fuel to air ratio not being correct, also if the timing of the spark is not just right that could cause it to back fire.
Melanoma in the United States. From 2005 to 2009, the median age at diagnosis for melanoma of the skin was 61, and the median age at death was 68. The age-adjusted incidence rate was 21.0 per 100,000 men and women per year.
What is melanoma? Melanoma is usually, but not always, a cancer of the skin. It begins in melanocytes â the cells that produce the pigment melanin that colors the skin, hair and eyes. Melanocytes also form moles, where melanoma often develops. Having moles can be a risk factor for melanoma, but itâs important to remember that most moles do not become melanoma.