The nematodes ( /ˈnɛmətoʊdz/) or roundworms (phylum Nematoda) are the most diverse phylum of pseudocoelomates, and one of the most diverse of all animals. Nematode species are very difficult to distinguish; over 28,000 have been described, of which over 16,000 are parasitic. The total number of nematode species has been estimated to be about 1,000,000. Unlike cnidarians or flatworms, roundworms have tubular digestive systems with openings at both ends.

Nematodes have successfully adapted to nearly every ecosystem from marine to fresh water, to soils, and from the polar regions to the tropics, as well as the highest to the lowest of elevations. They are ubiquitous in freshwater, marine, and terrestrial environments, where they often outnumber other animals in both individual and species counts, and are found in locations as diverse as mountains, deserts, oceanic trenches, and within the earth's lithosphere. They represent, for example, 90% of all life forms on the ocean floor. Their numerical dominance, often exceeding more than 1 million individuals per square meter and accounting for about 80% of all individual animals on earth, their diversity in lifestyles and their presence at various trophic levels point at an important role in many ecosystems. Their many parasitic forms include pathogens in most plants and animals (including humans). Some nematodes can undergo cryptobiosis.

Frederick Charles Hutchinson (August 12, 1919 – November 12, 1964) was an American professional baseball player, a major league pitcher for the Detroit Tigers. He also was a manager for three major league teams. Stricken with fatal lung cancer at the height of his managerial career as leader of the pennant-contending Cincinnati Reds, he was commemorated one year after his death when his brother, Dr. William Hutchinson, created the Fred Hutchinson Cancer Research Center as a division of the Pacific Northwest Research Foundation, in the Hutchinson's native city of Seattle, Washington. The FHCRC, which became independent in 1972, is now one of the best-known facilities of its kind in the world.

Fred Hutchinson, known throughout baseball as “Hutch,” attended the University of Washington, where he was a 1939 initiate of Alpha Sigma Phi Fraternity. A right-handed pitcher, he entered the organized baseball ranks in 1938 with the unaffiliated Seattle Rainiers of the AA Pacific Coast League and caused an immediate sensation at age 19, winning a league-best 25 games and that season’s Minor League Player of the Year award as bestowed by The Sporting News.