1 Type III, also called Kugelberg-Welander disease or juvenile spinal muscular atrophy, begins to affect kids as early as 18 months of age or as late as adolescence. This is the mildest form of SMA in children.  Type IV is the adult form of the disorder.
Minamata disease, sometimes referred to as Chisso-Minamata disease, is a neurological syndrome caused by severe mercury poisoning. Symptoms include ataxia, numbness in the hands and feet, general muscle weakness, narrowing of the field of vision and damage to hearing and speech.
Volcanic explosion. Three and a half thousand years ago, the tiny Aegean island of Thera was devastated by one of the worst natural disasters since the Ice Age - a huge volcanic eruption. This cataclysm happened 100km from the island of Crete, the home of the thriving Minoan civilisation. Fifty years after the eruption, that civilisation was in ruins. Did the volcano deliver a death blow to the Minoans? It's a whodunnit that has haunted historians and scientists for decades.