A fungus ( /ˈfʌŋɡəs/; plural: fungi or funguses) is a member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and molds (British English: moulds), as well as the more familiar mushrooms. These organisms are classified as a kingdom, Fungi, which is separate from plants, animals, and bacteria. One major difference is that fungal cells have cell walls that contain chitin, unlike the cell walls of plants, which contain cellulose. These and other differences show that the fungi form a single group of related organisms, named the Eumycota (true fungi or Eumycetes), that share a common ancestor (a monophyletic group). This fungal group is distinct from the structurally similar myxomycetes (slime molds) and oomycetes (water molds). The discipline of biology devoted to the study of fungi is known as mycology, which is often regarded as a branch of botany, even though genetic studies have shown that fungi are more closely related to animals than to plants.

Paul E. Stamets (born July 17, 1955) is an American mycologist, author, and advocate of bioremediation and medicinal mushrooms.

Stamets is on the editorial board of The International Journal of Medicinal Mushrooms, and is an advisor to the Program for Integrative Medicine at the University of Arizona Medical School, Tucson, Arizona. He is active in researching the medicinal properties of mushrooms, and is involved in two NIH-funded clinical studies on cancer and HIV treatments using mushrooms as adjunct therapies. Having filed numerous patents on the antiviral, pesticidal, and remediative properties of mushroom mycelia, his work has been called pioneering and visionary. A strong advocate of preserving biodiversity, Stamets supports research into the role of mushrooms for ecological restoration.

The author of numerous books and papers on the subject of mushroom identification and cultivation, Stamets has discovered four new species of mushrooms. He is an advocate of the permaculture system of growing, and considers fungiculture a valuable but underutilized aspect of permaculture. He is also a leading researcher into the use of mushrooms in bioremediation, processes he terms mycoremediation and mycofiltration.

Sir David Frederick Attenborough ( /ˈætənbərə/) OM, CH, CVO, CBE, FRS, FZS, FSA (born 8 May 1926) is a British broadcaster and naturalist.

His career as the face and voice of natural history programmes has endured for more than 50 years. He is best known for writing and presenting the nine Life series, in conjunction with the BBC Natural History Unit, which collectively form a comprehensive survey of all life on the planet. He is also a former senior manager at the BBC, having served as controller of BBC Two and director of programming for BBC Television in the 1960s and 1970s.

Attenborough is widely considered a national treasure in Britain, although he himself does not care for the term. He is a younger brother of director, producer and actor Richard Attenborough.

Attenborough was born in Isleworth, west London, but grew up in College House on the campus of the University College, Leicester, where his father, Frederick, was principal. He is the middle of three sons (his elder brother, Richard, became an actor and his younger brother, John, an executive at Italian car manufacturer Alfa Romeo). During World War II his parents also adopted two Jewish refugee girls from Europe.