Autism is a spectrum disorder that affects how people act and react. It affects more boys than girls with a 4 to 1 ratio. Autism is not a disease and people with autism are normal human beings. The condition is different for everyone and 1 in every 100 people are affected by autism. Famous people who are believed to have had autism include Isaac Newton, Albert Einstein, Bill Gates, and others. While autism can present challenges, it can also allow people to achieve amazing things and see the world differently.