By Leslie Vandever Since August, more than 3 million Americans and other people from all over the world have dumped buckets of ice-water over their heads on social media to help raise funds to fight the devastating motor neuron disease ALS (amyotrophic lateral sclerosis). Participants in the ALS Association’s Ice Bucket Challenge have included children, adults from all walks of life, Hollywood stars, and prominent politicians. ALS is a progressive neurodegenerative disease. It affects nerve cells in the brain and …