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.
Contrary to popular belief, there is no requirement that you have to be off work for six months or a year before you can apply for or collect disability benefits. You can apply for disability as soon as you quit work or are let go because of your medical conditionâor when you realize you are disabled and can't go back to work. However, you must be expected to not be able to work for at least one year (or have an illness that is likely to result in your death) to qualify for Social Security or SSI disability.