Yellow phlegm is normally a sign of an infection, or a case of the common cold. Greenish or brownish phlegm is nearly always a sign of infection. Greenish or rusty phlegm or phlegm with rusty spots can also be a sign of pneumonia. Coughing up brown phlegm is also a common symptom of excessive smoking.
A flowboard is a variation on a skateboard, combining aspects of surfing, skating and snowboarding.
A surfboard, invented in ancient Hawaii, is an elongated platform used to support an individual standing on them while breaking a wave. They are made of polyurethane or polystyrene foam covered with layers of fiberglass cloth, and polyester or epoxy resin, making them light, strong, buoyant and maneuverable.