http://www.ninds.nih.gov/disorders/a...detail_ALS.htm
"In 90 to 95 percent of all ALS cases, the disease occurs apparently at random with no clearly associated risk factors. Individuals with this sporadic form of the disease do not have a family history of ALS, and their family members are not considered to be at increased risk for developing it.
About 5 to 10 percent of all ALS cases are inherited. The familial form of ALS usually results from a pattern of inheritance that requires only one parent to carry the gene responsible for the disease. Mutations in more than a dozen genes have been found to cause familial ALS."
The fact remains some productive people have shitty defects. Yet somehow a random forum troll with no allergies is the paragon of humanity.