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  • Technology | Britannica.com
    or liquid A vibrating crystal creates the waves that are radiated continuously into the fluid medium striking a movable reflector placed accurately parallel to the crystal source actinoid element any of a series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium atomic numbers 89 103 As a group they are significant largely because of their radioactivity Although several members of the group including uranium adjuvant substance that enhances the effect of a particular medical treatment Administration of one drug may enhance the effect of another In anesthesia for example sedative drugs are customarily given before an operation to reduce the quantity of anesthetic adrenergic drug any of various drugs that mimic or interfere with the functioning of the sympathetic nervous system by affecting the release or action of norepinephrine and epinephrine These hormones which are also known as noradrenaline and adrenaline are secreted advanced ceramics substances and processes used in the development and manufacture of ceramic materials that exhibit special properties Ceramics as is pointed out in the article ceramic composition and properties are traditionally described as inorganic nonmetallic aegis in ancient Greece leather cloak or breastplate generally associated with Zeus the king of the gods and thus thought to possess supernatural power Zeus s daughter Athena adopted the aegis for ordinary dress Athena placed on her aegis a symbolic representation aerophone any of a class of musical instruments in which a vibrating mass of air produces the initial sound The basic types include woodwind brass and free reed instruments as well as instruments that fall into none of these groups such as the bull roarer aerospace engineering field of engineering concerned with the design development construction testing and operation of vehicles operating in the Earth s atmosphere or in outer space In 1958 the first definition of aerospace engineering appeared considering the Earth s agar gelatin like product made primarily from the algae Ge lidium and Gracilaria red seaweeds Best known as a solidifying component of bacteriological culture media it is used also in canning meat fish and poultry in cosmetics medicines and dentistry agricultural technology application of techniques to control the growth and harvesting of animal and vegetable products Soil preparation Mechanical processing of soil so that it is in the proper physical condition for planting is usually referred to as tilling adding nutrients agriculture the active production of useful plants or animals in ecosystems that have been created by people Agriculture has often been conceptualized narrowly in terms of specific combinations of activities and organisms wet rice production in Asia wheat farming agrochemical Any chemical used in agriculture including chemical fertilizers herbicides and insecticides Most are mixtures of two or more chemicals active ingredients provide the desired effects and inert ingredients stabilize or preserve the active ingredients air law the body of law directly or indirectly concerned with civil aviation Aviation in this context extends to both heavier than air and lighter than air aircraft Air cushion vehicles are not regarded as

    Original URL path: http://www.britannica.com/topic-browse/Technology (2016-02-13)
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  • Alphabetical Browse | Britannica.com
    d e f g h i j k l m n o p q r s t u v w x y z 08 Charter 1 3 butadiene 1 3 diphosphoglycerate 1917 Constitution of 1917 Revolution of 1989N4R 1990 Academy Awards 21 Grams 21 Jump Street 37 Generation of 3 7 dimethyl 2 6 octadienal 6 6 4 8t SdKfz 8th Annual Academy Awards 9to5 News About Us About Our

    Original URL path: http://www.britannica.com/sitemap (2016-02-13)
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  • New Articles | Britannica.com
    Marcel Duchamp She gained celebrity for her pottery for Mike Trout American baseball centre fielder who was one of the sport s best all around players of the early 21st century Trout was a baseball star at Millville New Jersey High School Bob Baffert American Thoroughbred racehorse trainer who was one of the most successful trainers in American horse racing history He notably trained American Pharoah which became the first George Miller Australian director screenwriter and producer who worked in a diverse range of genres but was best known for the futuristic action series Mad Max While studying medicine at Black Mountain College Experimental liberal arts college in Black Mountain North Carolina U S about 20 miles 32 km east of Asheville founded in 1933 by scholars John Andrew Rice and Theodore Marshall Sahlins American anthropologist educator activist and author who through his study of the people and culture of the South Pacific primarily Hawaii and Fiji made monumental contributions Nancy Holt American land artist known for her large site specific works and her role in the development of Land Art in the 1960s She also worked in film video and photography and created list of feminists This is an alphabetically ordered list of feminists organized by nationality and feminist generation or wave See also Equal Rights Amendment feminism National Organization list of cities and towns in the Netherlands This is an alphabetically ordered list of cities and towns in the Netherlands arranged by unitary state and then province See also city urban planning The Netherlands unitary list of cities and towns in Denmark This is an alphabetically ordered list of cities and towns in Denmark arranged by region See also city urban planning Region Hovedstaden Copenhagen Frederiksberg Gentofte American Pharoah foaled 2012 American racehorse Thoroughbred who in 2015 became

    Original URL path: http://www.britannica.com/new-articles (2016-02-13)
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  • Haiti Without a President | Britannica.com
    2011 During Martelly s term parliamentary and local elections failed to take place and were more than three years overdue by the time they were held in August and October 2015 The first round of the presidential election was also held in October with a second round scheduled to take place in late December Martelly s chosen successor a little known candidate from the private sector nevertheless won the largest share of the vote and advanced to the second round Various allegations of fraud were made and protesters took to the streets The runoff was postponed several times and finally shelved amid continuing unrest and the refusal of the second place candidate to participate During weeks of sometimes violent demonstrations demanding Martelly s resignation and counterprotests supporting him negotiations led to a deal reached in early February 2016 under which Martelly left office before the election of a successor An interim president was to be elected by the new parliament on April 24 A verification commission would review the October 2015 election results and determine whether the runoff could proceed or new elections would be called Read More on This Topic 1 Under what circumstances was Michel Martelly elected Haiti

    Original URL path: http://www.britannica.com/story/haiti-without-a-president (2016-02-13)
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  • Light-Sensing Bacteria, World’s Tiniest Eyeballs | Britannica.com
    the light source The basic principles of directional light sensing in Synechocystis are similar to those that function in human vision The ability to see and move toward light is critical for Synechocystis which depends on sunlight for energy production Read More on This Topic 1 Learn more about light reception in living organisms 2 How does the human eye focus light 3 What is another name for cyanobacteria Recommended

    Original URL path: http://www.britannica.com/story/light-sensing-bacteria-worlds-tiniest-eyeballs (2016-02-13)
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  • Year of the Monkey | Britannica.com
    days and include a variety of traditions that are meant to bring luck and happiness for the new year Families hold reunions small gifts are exchanged and special foods are eaten The festivities conclude with a Lantern Festival on the night of the first full moon The Chinese calendar is lunisolar days begin at midnight and months begin at the new moon This means that according to the Gregorian calendar Chinese New Year always falls between January 21 and February 20 Years are traditionally assigned one of 12 animal names that repeat in a sequence People born during a given animal s year are thought to share characteristics with it Those born in the year of the monkey are said to be curious mischievous and clever Read More on This Topic 1 Learn more about Chinese New Year celebrations 2 What happens during a Lantern Festival 3 What are some other ways the new year is celebrated LIST Our Days Are Numbered 7 Crazy Facts About Calendars And you thought page a day calendars were crazy Light Sensing Bacteria World s Tiniest Eyeballs Bee Pandemic Linked to Human Behavior Britannica Stories Behind The News Philosophy Religion Healing the Schism Pope

    Original URL path: http://www.britannica.com/story/year-of-the-monkey (2016-02-13)
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  • Bee Pandemic Linked to Human Behavior | Britannica.com
    can die off entirely and it is thought that this lethal combination has contributed to the loss of millions of bee colonies in the last few decades Scientists urge better regulation and stricter limits on hive movement in order to stop Varroa mites from entering new areas and infecting new hives with the virus Read More on This Topic 1 Learn more about honeybees 2 Why are honeybees so valuable

    Original URL path: http://www.britannica.com/story/bee-pandemic-linked-to-human-behavior (2016-02-13)
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  • Super Bowl Sunday: An Unofficial Holiday | Britannica.com
    however because it marks the 50th time it has been played since its inception in 1967 Over the years the game has grown to become the centerpiece of a daylong celebration called Super Bowl Sunday This unofficial national holiday in the United States is filled with festivities feasting and pageantry that extends from the stadium and host city to the homes and other places where football fans and their friends and families gather Long before kickoff takes place in the late afternoon early evening football aficionados are treated to hours of programming featuring the glories of past Super Bowls interviews with past and present NFL greats and hard boiled pre game analysis Closer to game time and continuing throughout the contest ticket holders and television viewers alike are shown performances by some of the best known musical acts as well as a cavalcade of creative television advertisements Illustration The Evolution of the Super Bowl This infographic gives various factual tidbits about how the Super Bowl evolved into a big budget national celebration Encyclop dia Britannica Inc Read More on This Topic 1 How did the Super Bowl come about 2 How has the National Football League changed throughout its history

    Original URL path: http://www.britannica.com/story/super-bowl-sunday-an-unofficial-holiday (2016-02-13)
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