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).
Thnx I hope its not ALS cause that would be devastating . There is no pain when it happens and it will happen any time of the day and twitch uncontrolably for anywhere from 10 minutes to over an hour. It seems to be twitching inbetween my thumb and index finger in that groove and on the inside of my thumb.