The term weed is used in both technical and general senses. In the general sense, a typical definition is "A herbaceous plant not valued for use or beauty, growing wild and rank, and regarded as cumbering the ground or hindering the growth of superior vegetation... Applied to a shrub or tree, especially to a large tree, on account of its abundance in a district... An unprofitable, troublesome, or noxious growth." In general, therefore, a weed is a plant that is considered by the user of the term to be a nuisance. The word commonly is applied to unwanted plants in human-controlled settings, especially farm fields and gardens, but also lawns, parks, woods, and other areas. More vaguely, "weed" is applied to any plants that grow and reproduce aggressively and invasively.

In weed ecology some authorities speak of the relationship between "the three Ps": plant, place, perception. These have been very variously defined, but the weed traits listed by H.G. Baker are widely cited.

Weeds may be unwanted for a number of reasons. The most important one is that they interfere with food and fiber production in agriculture, wherein they must be controlled in order to prevent lost or diminished crop yields. The next most important reason is that they interfere with other cosmetic, decorative, or recreational goals, such as in lawns, landscape architecture, playing fields, and golf courses. In all of these forms of horticulture, functional and cosmetic, weeds interfere by

Sanjay Gupta ( /ˈsɑːndʒeɪ ˈɡuːptə/ SAHN-jay GOOP-tə; born October 23, 1969) is an American neurosurgeon and an assistant professor of neurosurgery at Emory University School of Medicine and associate chief of the neurosurgery service at Grady Memorial Hospital in Atlanta, Georgia.

Known as a media personality on health-related issues, he is best known as CNN's multiple Emmy award winning chief medical correspondent, hosting the network's weekend health program Sanjay Gupta, M.D., and making frequent appearances on their American Morning, Larry King Live and Anderson Cooper 360° programs. His reports from Charity Hospital, New Orleans, Louisiana, in the wake of Hurricane Katrina helped the hospital to win a 2006 Emmy Award for "Outstanding Feature Story in a Regularly Scheduled Newscast". Additionally, Gupta publishes a column in Time magazine and is a special correspondent for CBS News. His books Chasing Life and Cheating Death were New York Times and national bestsellers. His latest book, Monday Mornings, a novel, was released in March, 2012 and became an instant New York Times Bestseller. It is currently being adapted as a television show with David E. Kelley and Gupta serving as Executive Producers.

Louis Freese, (born June 2, 1970) better known by his stage name B-Real, is an American rapper of Cuban and Mexican heritage, and a film and TV actor. He is best known for being the lead rapper in hip hop group Cypress Hill.

Born to a Mexican father and a Cuban mother, B-Real moved with his sister and mother out of his father's home to South Gate before ending up in South Central Los Angeles. Before dropping out of Bell High School, he befriended future Cypress Hill members Sen Dog and Mellow Man Ace (who forwent staying with the group to go solo). Sen Dog, who was affiliated with a Bloods gang set known as "Neighborhood Family", later introduced B-Real into the set. B-Real's career as a drug dealer and gangbanger ended after he was shot in the lung in 1988.

After being introduced to DJ Muggs by Julio G the KDAY Mixmaster, B-Real and Sen gained interest in Muggs' concept of an album based on experiences from Cypress Ave in South Gate. The group was signed with Ruffhouse/Columbia records in 1991, and made their influential debut that year. B-Real would use his life-threatening experiences as material for the group's self-titled debut album, and subsequent releases.

Walter Bruce Willis (born March 19, 1955) is a German-born American actor, producer, and musician. His career began in television in the 1980s and has continued both in television and film since, including comedic, dramatic, and action roles. He is well known for the role of John McClane in the Die Hard series, which were mostly critical and uniformly financial successes. He has also appeared in over sixty films, including box office successes like Pulp Fiction (1994), 12 Monkeys (1995), The Fifth Element (1997), Armageddon (1998), The Sixth Sense (1999), Unbreakable (2000), Sin City (2005), Over the Hedge (2006) and Red (2010).

Motion pictures featuring Willis have grossed US$2.64 billion to 3.05 billion at North American box offices, making him the ninth highest-grossing actor in a leading role and twelfth highest including supporting roles. He is a two-time Emmy Award–winning, Golden Globe Award–winning and four-time Saturn Award–nominated actor. Willis was married to actress Demi Moore and they had three daughters before their divorce in 2000, following thirteen years of marriage. He is currently married to model Emma Heming, with whom he has one daughter.

Seth Rogen (pronounced /ˈroʊɡɪn/; born April 15, 1982) is a Canadian stand-up comedian, actor, producer, screenwriter, and voice artist. Rogen began his career doing stand-up comedy during his teen years, winning the Vancouver Amateur Comedy Contest in 1998. While still living in his native Vancouver, he landed a small part in Freaks and Geeks. Shortly after Rogen moved to Los Angeles for his role, Freaks and Geeks was canceled after one season due to poor ratings. He then got a part on the equally short-lived Undeclared, which also hired him as a staff writer.

After landing a job as a staff writer on the final season of Da Ali G Show, for which Rogen and the other writers received an Emmy nomination, he was guided by film producer Judd Apatow toward a film career. Rogen was cast in a major supporting role and credited as a co-producer in Apatow's directorial debut, The 40-Year-Old Virgin. After Rogen received critical praise for that performance, Universal Pictures agreed to cast him as the lead in Apatow's directorial feature films Knocked Up and Funny People. Rogen and his comedy partner Evan Goldberg co-wrote the films Superbad, Pineapple Express, and The Green Hornet. Rogen has done voice work for the films Horton Hears a Who!, Kung Fu Panda, Monsters vs. Aliens, and Paul. He married fellow screenwriter Lauren Miller in October 2011.