A common speed limit encountered by all aeroplanes is the restriction to fly at 250 knots (288mph) or less when under an altitude of 10,000 feet, which falls into the Class B airspace level. In some cases the Class B level can extend a little higher.
Clinodactyly means that your child has an abnormally bent or curved finger. It is typically caused by abnormal growth and development of the small bones of the finger. It is estimated to affect about 10 percent of the general population to varying degrees. Clinodactyly can be an inherited condition and may present as a part of an associated syndrome. A significant percentage of people with Down syndrome, for example, have clinodactyly. The exact incidence of this condition is unknown, in part because there is no precise definition of what level of curvature is normal and abnormal. It tends to be present more commonly in boys and usually affects the small finger; it is unusual to have it on both hands. Learn more about the symptoms and causes of clinodactyly. The Hand and Orthopedic Upper Extremity Program
Boutonniere deformity, also called buttonhole deformity, can happen due to rheumatoid arthritis. The middle finger joint will bend toward the palm while the outer finger joint may bend opposite the palm. It may be the result of chronic inflammation of the finger's middle joint. Treatment may include splinting to keep the middle joint extended.