1 Multiple sclerosis (MS) is a disease that causes demyelination (disruption of the myelin that insulates and protects nerve cells) of spinal nerve and brain cells.  Although the exact case is unknown, multiple sclerosis is considered to be an autoimmune disease.
The skunk is not a rodent. They belong to the family Mephitidae and the order Carnivora which does not include rodentia. They are sometimes placed in the family Mustelidae (weasels) but have been discovered to be less related than was thought.
The largest rodent that ever lived was the size of a cow. It was 3m (9.8 ft) long, with a 1.5 m (5 ft.) tail, and probably weighed around 700 kg (1,543 lbs). This rodent could kill you if it sat on you. Actually, the figures cited are for Phoberomys pattersoni, which is only the second-largest rodent that ever lived.