What causes Autism?

Autism is caused by a neurological disorder which affects the brain normal fuction directly, but knowing the exact cause of this disorder is almost impossible because of how complicated our brain is. Our brain has over 100 billion nerve cells  called neurons, each neuron may be conected to thousands of other nerve cells located in specific areas in our brains, areas that give us the abilty to speak, move, feel, see, smell, remember, etc.  For some reason,  some of the cells and conections in children's brain who suffer from this don't develop correctly and get damaged; especailly those that affect communicacion and emotions.  Science is still trying to understand why and how this happens. Some doctors think that children who relatives had this disorder are more likely to have it.