Kari or KARI may refer to:

Wood is a hard, fibrous tissue found in many trees. It has been used for hundreds of thousands of years for both fuel and as a construction material. It is an organic material, a natural composite of cellulose fibers (which are strong in tension) embedded in a matrix of lignin which resists compression. Wood is sometimes defined as only the secondary xylem in the stems of trees, or it is defined more broadly to include the same type of tissue elsewhere such as in tree roots or in other plants such as shrubs.^{[citation needed]} In a living tree it performs a support function, enabling woody plants to grow large or to stand up for themselves. It also mediates the transfer of water and nutrients to the leaves and other growing tissues. Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber.

The earth contains about one trillion tonnes of wood, which grows at a rate of 10 billion tonnes per year. As an abundant, carbon-neutral renewable resource, woody materials have been of intense interest as a source of renewable energy. In 1991, approximately 3.5 billion cubic meters of wood were harvested. Dominant uses were for furniture and building construction.

Kari Elizabeth Byron (born December 18, 1974) is a San Francisco-based television host and artist, best known for her featured role on the Discovery Channel show MythBusters.

On MythBusters, Byron is a co-host and, with fellow co-hosts and "Build Team" members Tory Belleci and Grant Imahara, works with Adam Savage and Jamie Hyneman to test the plausibility of various myths. She and the others also host their own segments. She became involved in the show after persistently showing up at Hyneman's M5 Industries workshop in a desire to get hired by his company. On her first day as a paid employee, she was asked by Hyneman and MythBusters producer Peter Rees to help out with the "vacuum plane toilet" myth, and was asked to model her buttocks for a cast. She and the other Build Team members were given a more prominent role beginning with the show's second season. Not having had a long history in show business, Byron at first found it difficult to act naturally with this more visible position but gradually became more accustomed to it.