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Green
Green is the color between blue and yellow on the visible spectrum. It is evoked by light which has a dominant wavelength of roughly 495–570 nm. In subtractive color systems, used in painting and color printing, it is created by a combination of yellow and blue, or yellow and cyan; in the RGB color model, used on television and computer screens, it is one of the additive primary colors, along with red and blue, which are mixed in different combinations to create all other colors. By far the largest contributor to green in nature is chlorophyll, the chemical by which plants photosynthesize and convert sunlight into chemical energy. Many creatures have adapted to their green environments by taking on a green hue themselves as camouflage
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Early Modern Period
The early modern period of modern history follows the late Middle Ages of the post-classical era. Although the chronological limits of the period are open to debate, the timeframe spans the period after the late portion of the post-classical age (c. 1500), known as the Middle Ages, through the beginning of the Age of Revolutions (c
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Spring (season)
Spring is one of the four conventional temperate seasons, following winter and preceding summer. There are various technical definitions of spring, but local usage of the term varies according to local climate, cultures and customs. When it is spring in the Northern Hemisphere, it is autumn in the Southern Hemisphere and vice versa. At the spring, or vernal, equinox, days are approximately 12 hours long with day length increasing as the season progresses. Spring and "springtime" refer to the season, and also to ideas of rebirth, rejuvenation, renewal, resurrection and regrowth. Subtropical and tropical areas have climates better described in terms of other seasons, e.g. dry or wet, monsoonal or cyclonic
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Youth
Youth is the time of life when one is young, and often means the time between childhood and adulthood (maturity). It is also defined as "the appearance, freshness, vigor, spirit, etc., characteristic of one who is young". Its definitions of a specific age range varies, as youth is not defined chronologically as a stage that can be tied to specific age ranges; nor can its end point be linked to specific activities, such as taking unpaid work or having sexual relations without consent. Youth is an experience that may shape an individual's level of dependency, which can be marked in various ways according to different cultural perspectives
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Muslim World
The terms Muslim world and Islamic world commonly refer to the Islamic community (Ummah), consisting of all those who adhere to the religion of Islam, or to societies where Islam is practiced. In a modern geopolitical sense, these terms refer to countries where Islam is widespread, although there are no agreed criteria for inclusion. The term Muslim-majority countries is an alternative often used for the latter sense. The history of the Muslim world spans about 1400 years and includes a variety of socio-political developments, as well as advances in the arts, science, philosophy, and technology, particularly during the Islamic Golden Age. All Muslims look for guidance to the Quran and believe in the prophetic mission of Muhammad, but disagreements on other matters have led to appearance of different religious schools and branches within Islam
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House Of Commons
The House of Commons is the elected lower house of the bicameral parliaments of the United Kingdom and Canada and historically was the name of the lower houses of the Kingdom of England, Kingdom of Great Britain, Kingdom of Ireland, Northern Ireland, Southern Ireland, North Carolina and South Korea. Roughly equivalent bodies in other countries which were once British colonies or federations there of include the United States House of Representatives, the Australian House of Representatives, the New Zealand House of Representatives, and India's Lok Sabha. In the UK and Canada, the Commons holds much more legislative power than the respective upper house of parliament. The leader of the majority party in the House of Commons usually becomes the prime minister
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Leonardo Da Vinci
Leonardo di ser Piero da Vinci (Italian: [leoˈnardo di ˌsɛr ˈpjɛːro da (v)ˈvintʃi] (About this sound listen); 15 April 1452 – 2 May 1519), more commonly Leonardo da Vinci or simply Leonardo, was an Italian Renaissance polymath whose areas of interest included invention, painting, sculpting, architecture, science, music, mathematics, engineering, literature, anatomy, geology, astronomy, botany, writing, history, and cartography. He has been variously called the father of palaeontology, ichnology, and architecture, and is widely considered one of the greatest painters of all time
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Vietnamese Language
Vietnamese /viˌɛtnəˈmz/ (About this sound listen) (Tiếng Việt) is a Viet–Muong language that originated in the north of modern-day Vietnam, where it is the national and official language. It is the native language of the Vietnamese (Kinh) people, as well as a first or second language for the many ethnic minorities of Vietnam. As the result of Vietnamese emigration and cultural influence, Vietnamese speakers are found throughout the world, notably in East and Southeast Asia, North America, Australia and Western Europe
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Hope
Hope is an optimistic state of mind that is based on an expectation of positive outcomes with respect to events and circumstances in one's life or the world at large. As a verb, its definitions include: "expect with confidence" and "to cherish a desire with anticipation". Among its opposites are dejection, hopelessness and despair.

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Frequency
Frequency is the number of occurrences of a repeating event per unit of time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. The period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example: if a newborn baby's heart beats at a frequency of 120 times a minute, its period, T, — the time interval between beats—is half a second (60 seconds divided by 120 beats)
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Terahertz (unit)
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves. Hertz are commonly expressed in multiples: kilohertz (103---> Hz, kHz), megahertz (106---> Hz, MHz), gigahertz (109---> Hz, GHz), and terahertz (1012---> Hz, THz). Some of the unit's most common uses are in the description of sine waves and musical tones, particularly those used in radio- and audio-related applications
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Toxicity
Toxicity is the degree to which a chemical substance or a particular mixture of substances can damage an organism. Toxicity can refer to the effect on a whole organism, such as an animal, bacterium, or plant, as well as the effect on a substructure of the organism, such as a cell (cytotoxicity) or an organ such as the liver (hepatotoxicity). By extension, the word may be metaphorically used to describe toxic effects on larger and more complex groups, such as the family unit or society at large. Sometimes the word is more or less synonymous with poisoning in everyday usage. A central concept of toxicology is that the effects of a toxicant are dose-dependent; even water can lead to water intoxication when taken in too high a dose, whereas for even a very toxic substance such as snake venom there is a dose below which there is no detectable toxic effect. Toxicity is species-specific, making cross-species analysis problematic
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Mona Lisa
The Mona Lisa (/ˌmnə ˈlsə/; Italian: Monna Lisa [ˈmɔnna ˈliːza] or La Gioconda [la dʒoˈkonda], French: La Joconde [la ʒɔkɔ̃d]) is a half-length portrait painting by the Italian Renaissance artist Leonardo da Vinci that has been described as "the best known, the most visited, the most written about, the most sung about, the most parodied work of art in the world". The Mona Lisa is also one of the most valuable paintings in the world. It holds the Guinness World Record for the highest known insurance valuation in history at $100 million in 1962, which is worth nearly $800 million in 2017. The painting is thought to be a portrait of Lisa Gherardini, the wife of Francesco del Giocondo, and is in oil on a white Lombardy poplar panel
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Post-classical History
Post-classical history (also called the Post-Antiquity era, Post-Ancient Era, or Pre-Modern Era) is a periodization commonly used by the school of "world history" instead of Middle Ages (Medieval) which is roughly synonymous. The period runs from about 500 to 1450 AD though there may be regional differences and debates. The era was globally characterized by the expansion of civilizations geographically, the development of three of the great world religions (Christianity, Islam, and Buddhism), and development of networks of trade between civilizations. In Asia, the spread of Islam created a new empire and Islamic Golden Age with trade between the Asian, African and European continents, and advances in science in the medieval Islamic world. East Asia experienced the full establishment of power of Imperial China, which established several prosperous dynasties influencing Korea, Vietnam, and Japan
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