Snowshoe cat very vocal, though their voices are not as loud as the Siamese, a cat found in their breed heritage. They are noted as being very intelligent and have the ability to learn tricks and open doors. These cats also enjoy water, and may swim. In the 1960s, a cat, owned by Siamese cat breeder Dorothy Hinds-Daugherty, produced a litter of Siamese kittens in Philadelphia, Pennsylvania. Three of the kittens had unique markings, consisting of white points and feet. Intrigued by their looks, she began working to breed cats like them, using seal point Siamese with bicolor American Shorthairs. The offspring
Point source source decreases in proportion to the inverse square of the distance from the source, if the distribution is isotropic, and there is no absorption or other loss. In mathematics, a point source is a singularity from which flux or flow is emanating. Although singularities such as this do not exist in the observable universe, mathematical point sources are often used as approximations to reality in physics and other fields. Generally, a source of light can be considered a point source if the resolution of the imaging instrument is too low to resolve the source's apparent size. There are two types