Life and health

Hauke Hillen

Hauke Sven Hillen is a German structural biologist who leads a research group in Göttingen, known for crystal structures of human mitochondrial transcription initiation and anti-termination.

Haustorium

A haustorium, plural haustoria, is a specialized organ formed by fungi, oomycetes, and parasitic plants to draw nutrients from a living host plant while keeping host cells alive.

Haustrum, also Haustrinae rock shells, is a Perry 1811 genus of predatory muricid sea snails endemic to New Zealand and southern Australia, including H. haustorium, H. lacunosum, and the Oyster Borer H. scobina; unrelated namesakes include Pomacea haustrum and Argonauta haustrum.

Havana syndrome

Havana syndrome, or anomalous health incidents (AHI): symptoms first reported by US Embassy Havana staff in 2016, later hundreds of cases worldwide; cause contested, with US intelligence judging foreign adversary involvement very unlikely and NIH finding no MRI-detectable brain injury.

Havanese dog

Havanese (Bichon Havanais): the only dog breed native to Cuba, a Bichon-family toy companion with a long silky coat, 8.5-11.5 inches tall, 14-16 year lifespan, AKC rank No. 25.

Havapoo

Havapoo (Poovanese), a Havanese-Poodle crossbreed not AKC-recognized but registered by designer-dog clubs; under 15 lb, lifespan 10-18 years, low-shedding coat needing daily brushing, prone to PRA, patellar luxation, and periodontal disease.

HAVCR1

HAVCR1, also called TIM-1 and KIM-1, is a human gene encoding a cell-surface protein that hepatitis A virus uses to enter cells and that serves as a biomarker of kidney injury.

HAVCR2

HAVCR2 (TIM-3, CD366) is a human gene on 5q33.3 encoding an inhibitory immunoglobulin-superfamily immune checkpoint receptor on Th1 and exhausted T cells, with ligands galectin-9, phosphatidylserine, HMGB1, and CEACAM1, targeted in cancer immunotherapy.

Oct 15, 2026

Havfarm 1

Havfarm 1, named Jostein Albert, is a ship-shaped semi-submersible offshore salmon farm owned by Nordlaks. At 385 meters long, it is the largest semi-submersible structure ever built and holds about two million salmon.

Oct 20, 2026

Havrix

Havrix (hepatitis A vaccine, inactivated) is GSK's hepatitis A vaccine made from the HM175 strain grown in MRC-5 cells; the first licensed hepatitis A vaccine, FDA-approved in 1995.

Hawaiian crow

Hawaiian crow (ʻAlalā, Corvus hawaiiensis), a crow endemic to Hawaiʻi, extinct in the wild since 2002 and the only survivor of five Hawaiian corvid species; over 110 birds exist in San Diego Zoo Wildlife Alliance breeding facilities, with releases on Maui since 2024.

Hawaiian gold coral

Hawaiian gold coral (Kulamanamana haumeaae, formerly Gerardia sp.) is a deep-water zoanthid of the Hawaiian Archipelago at 343–575 m that secretes a golden protein skeleton, parasitizes bamboo corals, can live about 2,740 years, and was harvested for jewelry until 2001.

Hawaiian hawk

The Hawaiian hawk, known in Hawaiian as ʻio (Buteo solitarius), is a hawk found only on the island of Hawaiʻi, listed as endangered in 1967 and delisted in 2020.

Hawaiian hibiscus

Hawaiian hibiscus (aloalo) are the roughly six native Hibiscus species of Hawaii, including fragrant white kokiʻo keʻokeʻo (Hibiscus arnottianus, H. waimeae) and the endangered yellow state flower maʻo hau hele (Hibiscus brackenridgei).

Hawaiian monk seal

Hawaiian monk seal (Neomonachus schauinslandi, ʻīlioholoikauaua): endangered tropical earless seal endemic to the Hawaiian archipelago and Johnston Atoll; about 1,580 remain, growing since 2013; only pinniped solely within U.S. jurisdiction.

Hawk

Hawk: common name for over 250 diurnal raptor species in Accipitriformes (Accipitridae), distinct from falcons (Falconiformes, closer to parrots). Known for acute vision, taloned hindlimbs, open-country hunting, and use in falconry.

Hawkinsinuria

Hawkinsinuria (4-HPPD deficiency, OMIM 140350) is a rare autosomal dominant tyrosine metabolism disorder caused by HPD gene variants, causing infantile failure to thrive, metabolic acidosis, sparse hair, and lifelong urinary hawkinsin excretion.

Hawksbill sea turtle

Hawksbill sea turtle (Eretmochelys imbricata), a Critically Endangered coral-reef sea turtle of tropical oceans, the historic source of tortoiseshell, sponge-eating, ESA-endangered, CITES Appendix I, with key nesting populations in Australia and the Caribbean.

Hawthorne and His Mosses

"Hawthorne and His Mosses" is Herman Melville's 1850 two-part review of Hawthorne's Mosses from an Old Manse, published pseudonymously in the Literary World; it praised Hawthorne's "great power of blackness" and shaped Melville's reputation.

Hay

Hay: dried grass or legume forage cut, cured to 14-18% moisture, and baled to feed livestock; distinguished from silage and baleage, with harvest, storage, and quality practices and U.S. production around 123.5 million tons in 2025.

Hayatabad Medical Complex

Hayatabad Medical Complex (HMC), Peshawar, a public tertiary care Medical Teaching Institution in Hayatabad, Peshawar, Khyber Pakhtunkhwa, Pakistan, with PGMI, IKD, PICO, and KGMC units, over 1,280 beds, and millions of patients treated yearly.

Haydar Frangoul

Haydar Frangoul is a pediatric hematologist at Sarah Cannon in Nashville who led the pivotal clinical trials of exa-cel, a CRISPR therapy for sickle cell disease and thalassemia.

Hayflick limit

Hayflick limit: the finite number of divisions (~50 population doublings) normal human diploid cells undergo in culture before replicative senescence, caused by telomere shortening; discovered by Hayflick and Moorhead in 1961.

Hayley Okines

Hayley Leanne Okines (1997-2015), English progeria campaigner known as the 100-year-old teenager; wrote Old Before My Time and Young at Heart, joined Boston drug trials, died at 17 of pneumonia.

Hays S. Rye

Hays S. Rye, also published as Hays Rye, is an American biochemist and associate professor at Texas A&M University known for work on protein folding and the GroEL/GroES chaperonin.

Hazardous Waste Sites

Hazardous waste sites, also called Superfund or NPL sites, are contaminated locations requiring cleanup under CERCLA (1980) and RCRA (1976); about 1,341 U.S. Superfund sites exist, with cleanup funded by polluter-pays taxes.

Hazel

Corylus avellana, common hazel or European hazelnut, a Betulaceae shrub native to Europe and western Asia; wind-pollinated, self-sterile, source of the hazelnut crop dominated by Türkiye, distinct from Corylus maxima and americana.

Hazel Rose Markus

Hazel Rose Markus is a social and cultural psychologist who has been the Davis-Brack Professor at Stanford University since 1994 and is credited with founding cultural psychology.

Hazelden Betty Ford Foundation

Hazelden Betty Ford Foundation: nonprofit US addiction and mental health treatment provider formed by the 2014 merger of Hazelden (1949) and the Betty Ford Center (1982), headquartered in Center City, Minnesota, serving 30,000+ patients yearly across 15 locations in nine states.