Autism, a developmental disorder that appears in the first 3 years of life, and affects the brain's normal development of social and communication skills, affects kids from all walks of life. While the cause is still unknown, we do understand the disease more, and there are a variety of treatments to help. In the old days, autistic kids would be institutionalized. Today, with proper treatment, most children can grow to live long, happy lives. Below, you can check out Ethan busting out Piano Man by Billy Joel. Looks like Ethan has a great musical career ahead of him.