Hawkbit Hawkbits are dandelion-like flowers in the family Asteraceae. Their English language name derives from the Middle Ages belief that hawks ate the plant to improve their eyesight. Although originally native to Eurasia and North Africa, they have since become established in other countries, including the United States and New Zealand.
	Hawksbill turtle The Hawksbill turtle is a sea turtle that is distinguished by the following characteristics. *beak like mouth *elongated head tapering sharply to a point *V-shaped lower jaw *bird like appearance *alternating gait on land *flipper with two claw on each
	Hawkweed Hawkweed refers to any species in the very large genus Hieracium and its segregate genus Pilosella, in the sunflower family. They are common perennial plant, occurring worldwide in temperate regions, except in Australasia. They are usually small and weedy.
	Haworth Haworth is a village and tourist attraction, in the England county of West Yorkshire, best known for its association with the Bront.
	Hay Hay is dried Poaceae or legumes cut and used for animal feed. Pasture flowers are also frequently a part of the mix. Commonly used plants for hay include rye grass and perennial rye grass with mixtures of other pasture and clovers . Alfalfa makes a superior hay for cattle and horses in many countries.
	Hay Fever Hay Fever is a comic play written by Noel Coward in 1924 and first produced in 1925 with Marie Tempest as the first Judith Bliss. Best described as a cross between high farce and a comedy of manners, the play is set in a British country house in the 1920s, and deals with the four eccentric members of the Bliss family and their outlandish behaviour when they each invite a guest to spend the weekend.
	Hayfield Hayfield is a village and civil parish in the borough of High Peak, in the county of Derbyshire, England. The civil parish includes Hayfield village itself, along with Little Hayfield and part of Birch Vale.
	Haze Haze is an Earth's atmosphere phenomenon where dust, smoke and other pollutant particles obscure the normal clarity of the sky. It occurs when dust and smoke particles accumulate in relatively dry air. When weather conditions block the dispersal of smoke and other pollutants they concentrate and form a usually low-hanging shroud that impairs visibility and may become a Respiration health threat.
	Hazel The hazels are a genus of about ten species of deciduous trees and large shrubs native to the temperate northern hemisphere. The scientific name is Corylus, and it is placed in the birch family Betulaceae, though some botanists split the hazels into a separate family Corylaceae.
	He-Man He-Man is a heroic fictional character in a toy series called Masters of the Universe and the various spin-off products and media related to it. The most prominent is the animation series He-Man and the Masters of the Universe, produced by Filmation Studios. The syndicated series premiered in 1983 and ran until 1985, for a run of 130 episodes.
	Head In anatomy, the head of an animal is the rostral part that usually comprises the brain, eyes, ears, nose, and mouth. Some very simple animals may not have a head, but many bilateria do.
	Head crash A head crash occurs when the disk read-and-write head of a hard disk drive touches its rotating hard disk platter resulting in damage to the magnetic media on the platter surface. The head normally rides on a thin film of moving air entrapped at the surface of the platter.
	Head Games Head Games is the third album by United States rock and roll band Foreigner, released in 1979.
	Head gasket The head gasket sits between the engine block and cylinder head in an internal combustion engine. Its purpose is to seal the cylinders to ensure maximum compression. Occasionally, the compression ratio in the cylinder may cause a leak to form in the gasket. This problem has been exacerbated by the use of aluminum rather than iron cylinder heads; while lighter than iron, aluminum has a much greater thermal expansion rate, which in turn causes a great deal more stress to be placed on the head gask
	Head louse Head lice are one of the many varieties of sucking lice specialized to live on different areas of various animals. As the name implies, head lice are specialized to live among the hair present on the human head and are exquisitely adapted to living mainly on the scalp and neck hairs of their human host.
	Head of State Head of State or Chief of State is the generic term for the individual or collective office that serves as the chief public representative of monarchic or republican nation-state, federation, commonwealth or any other political state. His or her role generally includes personifying the continuity and legitimacy of the state and exercising the political powers, functions and duties granted to the Head of State in the country's constitution.
	Head-On Head-On is a 2004 in film film written and directed by Fatih Akin. At the 2004 European Film Awards, the movie won the "Best Film" and the "Audience Award".
	Headband A headband is an article of clothing that is designed to be worn on or around a person's head. Headbands generally consist of an rectangle strip of cloth, or a horseshoe-shaped piece of flexible plastic or metal. They come in assorted shapes and sizes and are used for both practical and fashion purposes.
	Headgear Headgear, headwear or headdress is the name given to any element of clothing which is worn on one's head. Headgear serve a variety of purposes: *protective clothing *to keep hair contained or tidy *decoration or fashion *religious purposes *medical purposes
	Headlamp A headlamp is a lamp, usually attached to the front of a vehicle such as a automobile, with the purpose of illuminating the road ahead during periods of low visibility, such as night or precipitation. While it is common for the term headlight to be used interchangeably in informal discussion, headlamp is the technically correct term for the device itself, while headlight properly refers to the beam of light produced and distributed by the device
	HeadLand headLand was an Australian drama television series produced by the Seven Network set in a university. The Seven Network filmed 52 episodes in the first series. Production on the second series had begun before any episodes were aired. headLand premiered in Australia on Tuesday, 15 November 2005 at 7.30pm.
	Headline For an article about a U.S. television series which aired under this title, see Big Town. A headline is text at the top of a newspaper article, indicating the nature of the article below it. Headlines may be written in bold, and are written in a much larger size than the article text.
	Headphones Headphones are a pair of transducers that receive an electrical signal from a media player or receiver and use Loudspeakers placed in close proximity to the ears to convert the signal into audible sound waves. In the context of telecommunication, the term headset is also commonly understood to refer to a combination of headphones and microphone used for two-way communication, for example with a mobile phone.
	Headrest In an automobile, the headrest is a device attached to the top of the seat behind the occupant's head. Headrests are featured mainly for comfort as well as safety, as they can break the backlash movement of the occupant's head during a collision; thus preventing potentially fatal neck injury.
	Headroom Headroom is a term used in signal processing to refer to the maximum allowable signal level before Audio level compression or distortion. In an sound reproduction system headroom is the amount by which the maximum permitted level, or digital FS exceeds the alignment level, in dB.
	Headscarf Headscarves are scarf covering most or all of the top of a womans hair and her head. Headscarves may be worn for a variety of purposes; this article describes the headscarf used for: *fashion or social distinction *religious purposes *modesty; social convention Headscarves may have specific religious significance.
	Headspace In firearms terms, headspace refers to the distance between the bolt face and chamber necessary for reliable functioning of the weapon, or as a verb, the Machine by which the correct positioning is achieved. The headspace is the distance measured from the part of the chamber that stops forward motion of the Cartridge, usually called the datum line, to the face of the bolt.
	Headstock Headstock or peghead is a part of guitar or similar stringed instrument. The main function of a headstock is holding the instrument's strings. Strings go from the bridge, pass the nut and are usually fixed on machine heads on headstock. Machine heads are used to tune the guitar by adjusting the tension of strings and, consequentially, the pitch of sound they produce.
	Headstone A headstone, tombstone or gravestone is a permanent marker, normally carved from Rock, placed over or next to the site of a burial in a cemetery or elsewhere.
	Health Health is the functional and/or metabolic efficiency of an organism, at any moment in time, at both the cellular and global levels. In any organism, health is the ability to efficiently respond to challenges and effectively restore and sustain a "state of balance," known as homeostasis.
	Hearing aid A hearing aid is a device used to help hard-of-hearing people Hearing sounds better. In the past, a funnel-like amplification cone, called an "ear trumpet" or "ear horn", was used. Also sometimes used was a desk with a built-in amplifier into which a microphone and earphones could be plugged; these worked better
	Hearse A hearse is a funeral vehicle, a conveyance for the coffin from e.g. a church to a cemetery, a similar burial site, or a crematorium. In the funeral trade, they are often called funeral coaches.
	Heart The heart is a hollow, muscle organ in vertebrates, responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods. The term cardiac means "related to the heart" and comes from the Greek language ?a?d??, kardia, for "heart." The heart is composed of cardiac muscle, an involuntary muscle tissue which is found only within this organ.
	Heart rate Heart rate is a term used to describe the frequency of the cardiac cycle. It is considered one of the four vital signs. Usually it is calculated as the number of contractions of the heart in one minute and expressed as "beats per minute". See "Heart" for information on embryofetal heart rates.
	Heart valve In anatomy, the heart valves are valves in the heart that maintain the unidirectional flow of blood by opening and closing depending on the difference in pressure on each side. The mechanical equivalent of the heart valves would be the reed valves. There are four valves of the heart:
	Heart-lung machine A Heart-Lung Machine is a device that temporarily takes over the function of the heart and lungs. This technique is referred to as Cardiopulmonary Bypass. Heart-Lung Machines are operated by allied health professionals known as Perfusionists. It is an extracorporeal therapy.
	Heartless The are beings that are hearts corrupted by darkness and without a body or a soul, from the video game Kingdom Hearts series. They serve as most of the battles and challenges that the player must go through to complete the games. They come in a large variety of types, categorized by being Pureblood or Emblem.
	Heartsease The Heartsease is a common European wild flower, growing as an Annual plant or short-lived perennial. It has been introduced species into North America, where it has spread widely, and is known as the Johnny Jump Up. It is the progenitor of the cultivated Pansy, and is therefore sometimes called the Wild Pansy; before the cultivated Pansies were developed, "pansy" was an alternative name for the wild form.
	Heat In physics, heat, symbolized by Q, is defined as energy in transit. Generally, heat is a form of energy transfer associated with the different motions of atoms, molecules and other particles that comprise matter when it is hot and when it is cold. High temperature bodies from which there will often be high heat transfer can be created by chemical reactions , nuclear reactions , electromagnetic dissipation , or mechanics dissipation .
	Heat engine In engineering and thermodynamics, a heat engine performs the conversion of heat energy to mechanical work by exploiting the temperature gradient between a hot "source" and a cold "sink". Heat is heat transfer from the source, through the "working body" of the engine, to the sink, and in this process some of the heat is converted into energy by exploiting the properties of a working substance .
	Heat exchanger A heat exchanger is a device built for efficient heat transfer from one fluid to another, whether the fluids are separated by a solid wall so that they never mix, or the fluids are directly contacted. They are widely used in refrigeration, air conditioning, space heating, power production, and chemical processing.
	Heat pump A heat pump is a machine which moves heat from a low temperature reservoir to a higher temperature reservoir under supply of Mechanical work. Common examples are: * refrigerators * air conditioners * gas compression heat pumps * phase change heat pumps * thermoelectric heat pumps that use the Peltier effect
	Heat sink A heat sink is an environment or object that absorbs and dissipates heat from another object using thermal contact. In common use, it is a metal object brought into contact with an electronic component's hot surface — though in most cases, a thin thermal interface material mediates between the two surfaces.
	Heat wave A heat wave is a prolonged period of excessively hot weather, which may be accompanied by high humidity. There is no universal definition of a heat wave; the term is relative to the usual weather in the area. Temperatures that people from a hotter climate consider normal can be termed a heat wave in a cooler area if they are outside the normal climate pattern for that area.
	Heath Hen The Heath Hen was a distinctive subspecies of the Greater Prairie Chicken, Tympanuchus cupido, a large North American bird in the grouse family, or possibly a distinct species. Heath Hens lived in the scrubby heathland barrens of coastal New England, from southernmost New Hampshire to northern Virginia in historical times, but possibly south to Florida prehistorically.
	Heathers Heathers is a 1989 in film black comedy film starring Winona Ryder, Shannen Doherty, and Christian Slater. It is widely viewed as a classic teenage comedy of the 1980s, considered revolutionary at the time because of its high levels of violence, cruelty, black humor and absurdity, especially for a movie set in high school, and is often considered one of the finest black comedies ever made.
	Heaven Heaven is an afterlife concept found in many religions or spirituality philosophy. Those who believe in heaven generally hold that it is the afterlife destination of many or all humans. In unusual instances, humans have had, according to many testimonies and traditions, personal knowledge of Heaven.
	Heavens Heavens is a rock band from USA featuring Matt Skiba of Alkaline Trio and Josiah Steinbrick. Steinbrick does the instrumentation side in the band, with Skiba singing. The duo signed to Epitaph Records in 2006, and release their debut album Patent Pending on the label on 12 September 2006 and the following day in the USA.
	Heavy Weapon Heavy Weapon is a Side-scrolling game shooting game developed by PopCap Games and released in 2005.
	Hebei Hebei is a northern province of China of the People's Republic of China. Its one-Chinese character abbreviation is "?", named after Ji Province, a Han Dynasty province that included southern Hebei. The name Hebei means "north of Huang He".
	Hebrew calendar The Hebrew calendar or Jewish calendar is the annual calendar used in Judaism. It determines the dates of the Jewish holidays, the appropriate Torah portions for public reading, Yahrzeits , and the specific daily Psalms which some customarily read. Two major forms of the calendar have been used: an observational form used prior to the Siege of Jerusalem of the Second Temple in 70 Common era, and based on witnesses observing the phase of the moon, and a rule-based form first
	Hebrides The Hebrides comprise a widespread and diverse archipelago off the west coast of Scotland, and in geology terms are composed of the oldest rocks in the British Isles. They can be divided into two main groups: * Inner Hebrides, including Isle of Skye, Isle of Mull, Islay, Jura, Scotland, Staffa and the Small Isles
	Hecate Hecate, Hekate , or Hekat was originally a goddess of the wilderness and childbirth originating from Thrace, or among the Carians of Anatolia . Popular cults venerating her as a mother goddess integrated her persona into Greek culture as ???t?. In Alexandria she ultimately achieved her connotations as a goddess of sorcery and her role as the 'Queen of Ghosts', in which guise she was transmitted to post-Renaissance culture.
	Heckelphone The heckelphone is a musical instrument invented by Wilhelm Heckel and his sons, introduced in 1904. It is a double reed instrument of the oboe family, but with a wider bore and hence a heavier and more penetrating tone. It is pitched an octave below the oboe and furnished with an additional semitone taking its range down to A.
	Hector In Greek mythology, Hector , or Hektor, was a Troy prince and one of the greatest fighters in the Trojan War. He was the son of Priam and Hecuba, and leader of Trojans and their allies in defense of Troy. He initially did not approve of war between the Achaeans and the Trojans.
	Hector Berlioz Louis Hector Berlioz was a French people Romantic music composer best known for the Symphonie Fantastique, first performed in 1830, and for his Requiem of 1837, with its tremendous resources that include four antiphonal brass choirs.
	Hedera helix Hedera helix is a species of ivy native to most of Europe and southwest Asia. It is an evergreen climbing plant, growing to 20-30 m high where suitable surfaces are available, and also growing as ground cover where there are no vertical surfaces. It holds on to tree bark and rock by means of short adhesive rootlets.
	Hedge Garlic Hedge Garlic, also known as Jack by the Hedge, is a member of the Cabbage family Brassicaceae. An invasive species native to Europe and Asia, it is now found in many parts of the world. When the Leaf are crushed they produce a strong garlic smell, hence the name.
	Hedgehog A hedgehog is any of the small spiny mammals of the subfamily Erinaceinae and the Order Insectivora. There are 15 species of hedgehog in four genus, found through parts of Europe, Asia, Africa, and New Zealand. There are no hedgehogs native to the Americas or Australia.
	Heed Heed is a Sweden heavy metal music band founded in 2004 by ex-Lost Horizon members Daniel Heiman and Fredrik Olsson. They were joined by drummer Mats Karlsson and bass player Jrgen Olsson, and began recording on their debut album The Call.
	Heimdal Heimdal is the southernmost borough in Trondheim, Norway named after the god Heimdall in Norse mythology. The area has been continuously inhabited at least since the Iron Age, and is rich in arcehological sites. The area around the railway station was until 1964 the center of two separate local municipalities, Tiller and Leinstrand.
	Heimdall Heimdall is one of the sir in Norse mythology.
	Heinrich Himmler Heinrich Luitpold Himmler was the commander of the German Schutzstaffel and one of the most powerful men in Nazi Germany. As Reichsfhrer-SS he controlled the SS and the Gestapo. Himmler became a leading organizer of the Holocaust. As founder and officer-in-charge of the Nazi concentration camps and the Einsatzgruppen death squads, Himmler held final command responsibility for implementing the industrial-scale genocide of between 6 and 12 million people.
	Heinrich Schliemann Heinrich Schliemann was a Germany classical archaeologist, an advocate of the historical reality of places mentioned in the works of Homer, and an important excavator of Mycenaean sites, such as Troy, Mycenae and Tiryns.
	Heinrich von Kleist Bernd Heinrich Wilhelm von Kleist was a German poet, dramatist and novelist. The Kleist Prize, a prestigious prize for German literature, is named after him.
	Hejaz Hejaz is a region in the northwest of present-day Saudi Arabia. Its main city is Jeddah, but it is probably better-known for the Islamic holy city of Mecca. As a region, The Hijaz, as it is often referred to, because of being the site of Islam's holy places, has significance in the Arab and Islamic historical and political landscape.
	HeLa A HeLa cell is an Cell culture#Concepts used in medical research. The cell line was derived from cervical cancer cells taken from Henrietta Lacks, who died from her cancer in 1951.
	Helen Helen , often known as Helen of Troy, was reputed to be the most beautiful mortal woman in Greek mythology. The daughter of Zeus by Leda , she was the sister of Castor and Pollux, and Clytemnestra. Originally the wife of Menelaus, her abduction by Paris brought about the Trojan War.
	Helen Hayes Helen Hayes was a two-time Academy Awards-winning American actress whose successful and award-winning career spanned almost 70 years. She was eventually to garner the nickname "First Lady of the American Theater", and was one of the nine people List of people who have won an Emmy, a Grammy, an Oscar and a Tony Award.
	Helen Hunt Jackson Helen Maria Hunt Jackson was an United States writer best known as the author of Ramona, a novel about the ill-treatment of Indians in Southern California.