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).
Most people with ALS first feel muscle cramps, spasms or twitching (fasciculations) in one of their arms or legs. Other signs include weakness in the hands and feet or loss of balance. This form of the disease is called limb-onset ALS. About 25% of people with ALS first have trouble talking clearly - slurring words.