Tic
Simple motor tics are typically sudden, brief, meaningless movements that usually involve only one group of muscles, such as eye blinking, head jerking, or shoulder shrugging. Motor tics can be of an endless variety and may include such movements as hand clapping, neck stretching, mouth movements, head, arm or leg jerks, and facial grimacing.
Motorized scooter
A motorized scooter is a powered stand-up scooter using a small utility gas engine or electric motor. These scooters are generally designed with a large deck in the center on which the rider stands. The first production scooter, the "Sport" was released by Go-Ped in 1985. Recently electric kick scooters have grown in popularity with the introduction of ride share companies that use apps that allow users to rent the scooters by the minute. These have been introduced in large cities such as Washington D.C., Las Vegas, San Francisco, Austin, and Denver. Other large cities like Seattle are trying to keep these scooter sharing companies out until they can modify laws and roads to make them safer. Fans of the scooters see them as cheap and easy alternatives to zip around the city, while others have their doubts about the long term impact. Certainly, these scooters could be a great solution in cities where traffic is so congested it has come to a standstill, but concerns about safety and feasibility should not be ignored. Companies should ensure that riders are aware of local laws and give safety warnings, maintain scooters including fixing or removing broken ones from public areas, and do their due diligence to make sure that riders and scooters do not become a nuisance. Riders can stay safe by checking their local laws, taking precautions such as wearing helmets, and being aware of their surroundings while riding.Electric kick scooters have generally surpassed gas engined scooters in popularity since 2000. They usually have two hard small wheels, with a foldable chassis, usually aluminum. Some kick scooters have 3 or 4 wheels, or are made of plastic, or are large, or do not fold. High performance trickster scooters made for adults resemble the 19th century penny-farthing, with a much larger wheel in front. Electric kick scooters differ from mobility scooter in that they also allow human propulsion, and have no gears. Range typically varies from , and maximum speed is around .