It is suggested that in many ferromagnetic materials there may occur particles distinct in magnetic character from the general matrix, and below the critical size, depending on shape, for which domain ...

Head colds are very contagious. When a person with a head cold sneezes or coughs, droplets that contain the virus can travel through the air and reach other people who could contract the virus.

Leaf shape can vary considerably. The most common shapes include oval, truncate, elliptical, lanceolate, and linear. Leaf tips and bases may also be unique, with names based on their shapes.