Autism is a biological disorder in the brain that impairs communication and social skills. The severity of Autism can range from mild to severe. When trying to explain what Autism is some describe it as autistic's being in their "own world". Those who have this and have high functioning, see things as "their world" and the "outside world". Many who are autistic describe what they are experiencing as thinking in pictures. Some actions that happen to those who have autism is the absence or delay of speech and language such as repetition of words. Difficulty relating to other children and adults which may be shown in the absence of eye contact, apparent aloofness, lack of interest in other children, avoidance of physical touching and the indifference to others in distress or pain. An example of this happened when a three year old autistic child and her mother were playing in their back yard and the father was in the front yard. When playing, the mom fell from the swing-set and broke her leg badly. The mom was not able to get up or move and so was unable to get to the front yard to her husband. The mom fell on the ground and was yelling in pain while the child continued to play in the sand box, her main item of intense focus at that moment. The child was completely unaware of the fact that her mom was yelling in pain. The dad in the front yard finally hear the mom's cries and came to her aid. This was an extreme example of an autistic person's unawareness of situations, and the feeling of others. Some other examples of autism is odd behaviors such as self-stimulation, spinning, rocking, hand flapping, etc. Inappropriate laughter or tantrums for no reason at all, also in appropriate attachment to objects, obsessive-compulsive behaviors such as lining up objects or repeating a ritual over and over again. Some are unable to deal with the interruption of their routine schedule or change, and could possibly injure themselves or become aggressive toward others.