Multiple sclerosis (MS), also known as disseminated sclerosis or encephalomyelitis disseminata, is a demyelinating disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged.ultiple sclerosis is the most common autoimmune disorder affecting the central nervous system. As of 2008, between 2 and 2.5 million people are affected globally with rates varying widely in different regions of the world and among different populations. In 2013, 20,000 people died from MS, up from 12,000 in 1990.
Calamities of the 20th and 21st centuries. CBC Arts Posted: May 08, 2008 12:44 PM ET Last Updated: Aug 30, 2010 2:17 PM ET. The following is a list of some of the worst natural calamities to strike the world since 1900. The list is by definition arguable. Earthquakes, volcanic eruptions, tsunamis, cyclones, hurricanes and other storms are all clearly natural phenomena. But the picture is less clear for disasters like floods and famine.
The Exxon Valdez Oil Spill left behind a trail of dead bodies of thousands of birds and animals. One of the worst kind of disasters ever caused and seen by man, the Exxon Valdez Oil Spill affected not only the environment but also the way people dealt with the natural environment. slide 1 of 5.