A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke.
If you were born in 1929 or later, you need to work at least 10 years to become eligible for Social Security. The SSA determines eligibility with a system of credits. Basically, you earn up to four credits for every year worked, and you need a total of 40 credits to qualify for Social Security.
Most American workers are entitled to receive a monthly Social Security retirement benefit by age 62. The average monthly Social Security check in 2015 is $1,328. But how does the government figure out how much each worker should receive? The key to calculating someoneâs Social Security benefit is to first figure out their Primary Insurance Amount (PIA). The PIA is the baseline amount for your Social Security benefits. The amount of your benefit depends on many factors, including how long you worked, your income and how old you are when you retire.