Down syndrome is caused by a flaw in the genetic code that affects the mental and physical development of people with it. Readers will examine this condition and its causes, and learn about research that led to our current understanding. They will survey new treatments and new research. This book also introduces people who have excelled despite being challenged with this condition, and the people who have moved science forward in understanding down syndrome. Fact boxes, sidebars, and detailed images support the informative main narrative. A special section explains how sufferers face bullying, and what to do in order to stop it.