The great white shark is very well known for its size, with the  largest individuals known to have approached or exceeded 6 metres  (20 ft) in length and 2,268 kilograms (5,000 lb) in weight. It  reaches maturity at around 15 years of age and can have a life span  of over 30 years.
Benign fasciculation syndrome is characterized by occasional or nearly continuous twitching of various skeletal (voluntary) muscles in the body. This type of muscle twitching can also be seen in association with serious disorders like spinal injury, multiple sclerosis (MS) or amyotrophic lateral sclerosis (ALS).
ALS is often called Lou Gehrig's disease, after the famous baseball player who was diagnosed with it. ALS is a type of motor neuron disease that causes nerve cells to gradually break down and die. In the United States, ALS is sometimes called motor neuron disease.In most cases, doctors don't know why ALS occurs. A small number of cases are inherited.ALS often begins with muscle twitching and weakness in an arm or leg, or sometimes with slurring of speech.n the United States, ALS is sometimes called motor neuron disease. In most cases, doctors don't know why ALS occurs. A small number of cases are inherited. ALS often begins with muscle twitching and weakness in an arm or leg, or sometimes with slurring of speech.