Yacht, Summer, Sushi, Taekwondo, Tsunami, Violin, Washing Machine. Find out about the inner workings and origins of the things that pique your curiosity. Yacht: A yacht is a boat or ship that is mainly used for recreational purposes. Summer: Summer is one of the four temperate seasons. It succeeds spring and precedes autumn. Sushi: Sushi is a Japanese delicacy that consists of cooked vinegary rice known as sushi-meshi, and various ingredients such as seafood, meat, vegetables, or fruits. Taekwondo: Taekwondo is a Korean martial art that emphasizes various kicking techniques. Tsunami: A tsunami occurs when a huge volume of water in an ocean, sea, or large lake is displaced, causing a series of waves. Violin: A violin is a string instrument that is usually made of wood. It is informally referred to as a fiddle. Washing Machine: A washing machine is a machine that washes laundry automatically, instead of hand washing, the traditional way of doing laundry.