Idiopathic Adolescent Acute Neurodegeneration or IAAN for short (also known as Everhart's disease, named after its first fatal victim), is a fatal disease affecting children between the ages 8-13. Over 98% of the USA's children population died from this disease. Life for the surviving 2% of children was more than torture.
IAAN was known to not have any specific symptoms. The only real symptom was death without warning. The 2% that survived IAAN were given powers.
The cause of IAAN is Ambroisia, a chemical that was released into food and water supplies by terrorists. After this discovery, men, women, children and even those who were pregnant were tested for abnormalities, and none were found until after the births of children post-Ambrosia exposure. The children showed no symptoms until their tenth birthday, in which the children either died or developed abilities.