Solar cells today are mostly made of silicon, one of the most common elements on Earth. The crystalline silicon solar cell was one of the first types to be developed and it is still the most common type in use today. They do not pollute the atmosphere and they leave behind no harmful waste products.
In the last few years, doctors find the probable cause of bipolar disorder is an inherited lack of stability in nerve impulse transmission in the brain. This biochemical brain problem causes people with bipolar disorder to be more susceptible to physical and emotional stresses. Researchers have found several genes that could be linked to the disorder. This may explain why bipolar disorder seems to run in families.
Autism 1. Description: Autistic disorder is categorized as a Pervasive developmental disorder, according to the DSM –IV TR; it is usually diagnosed in the toddler and/or early childhood years. According to Ben J. Atchison (2007), Autism falls in the Autistic Spectrum Disorder (ASD) umbrella, alongside other developmental disorders such as Rett’s disorder, Asperger’s disorder and etc, each varying in the degrees of their severity. Autistic disorder is marked by detachment and impairment in social, communication and behavioral skills and development.