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Superball
A Super Ball or Superball is a toy bouncy ball based on a type of synthetic rubber invented in 1964 by chemist Norman Stingley. It is an extremely elastic ball made of Zectron, which contains the synthetic polymer polybutadiene as well as hydrated silica, zinc oxide, stearic acid, and other ingredients. This compound is vulcanized with sulfur at a temperature of and formed at a pressure of . The resulting Super Ball has a very high coefficient of restitution, and if dropped from shoulder level on a hard surface, a Super Ball bounces nearly all the way back; thrown down onto a hard surface by an average adult, it can fly over a three-story building. History Stingley sought uses for his polybutadiene synthetic rubber, as well as someone to manufacture it. He first offered his invention to the Bettis Rubber Company, for whom he worked at the time, but they turned it down because the material was not very durable. So Stingley took it to toy company Wham-O; they worked on develo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bouncy Ball
A bouncy ball or rubber ball is a spherical toy ball, usually fairly small, made of elastic material which allows it to bounce against hard surfaces. When thrown against a hard surface, bouncy balls retain their momentum and much of their kinetic energy (or, if dropped, convert much of their potential energy to kinetic energy). They can thus rebound with an appreciable fraction of their original force. Natural rubber originated in the Americas, and rubber balls were made before European contact, including for use in the Mesoamerican ballgame. Christopher Columbus witnessed Haitians playing with a rubber ball in 1495. Spaldeens Rubber balls such as the Spaldeen (a corruption of Spalding, the manufacturer), about the size of a tennis ball A tennis ball is a ball designed for the sport of tennis. Tennis balls are fluorescent yellow in organised competitions, but in recreational play can be virtually any color. Tennis balls are covered in a fibrous felt which modifies their aer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alcides Lanza
Alcides Emigdio Lanza (born 2 June 1929) is a Canadian composer, conductor, pianist, and music educator of Argentinian birth. He became a naturalized Canadian citizen in 1976. As both a composer and performer he is known as an exponent of contemporary classical music and avant-garde music. His works often utilize a combination of traditional and unusual instruments, and incorporate electronic sounds and extensions. He is also known for using special lighting effects when presenting his music. Many of his compositions are published by Boosey & Hawkes, and lanza himself owns his own publishing company, Shelan Editions. He is an associate of the Canadian Music Centre, a member of the Canadian League of Composers., and an Honorary Member of the Canadian Electroacoustic Community. Education Born in Rosario, Santa Fe, lanza received his initial musical training in Buenos Aires where he was a pupil of Julián Bautista ( music composition), Ruwin Erlich (piano), Alberto Ginastera (co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glitter Super Ball
Glitter is an assortment of small, reflective particles that come in a variety of shapes, sizes, and colors. Glitter particles reflect light at different angles, causing the surface to sparkle or shimmer. Glitter is similar to confetti, sparkles and sequins, but somewhat smaller. Since prehistoric times, glitter has been made from many different materials including stones such as malachite, and mica, as well as insects and glass. Modern glitter is usually manufactured from the combination of aluminum and plastic which is rarely recycled leading some scientists to call for bans on plastic glitter. Antiquity Glittering surfaces have been found to be used since prehistoric times in the arts and in cosmetics. The modern English word "glitter" comes from the Middle English word ''gliteren'', possibly by way of the Old Norse word '' glitra.'' However, as early as 30,000 years ago, mica flakes were used to give cave paintings a glittering appearance. Prehistoric humans are believed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physics Education
Physics education refers to the methods currently used to teach physics. Physics Education Research refers to an area of pedagogical research that seeks to improve those methods. Historically, physics has been taught at the high school and college level primarily by the lecture method together with laboratory exercises aimed at verifying concepts taught in the lectures. These concepts are better understood when lectures are accompanied with demonstration, hand-on experiments, and questions that require students to ponder what will happen in an experiment and why. Students who participate in active learning for example with hands-on experiments learn through self-discovery. By trial and error they learn to change their preconceptions about phenomena in physics and discover the underlying concepts. Ancient Greece Aristotle wrote what is considered now as the first textbook of physics. Aristotle's ideas were taught unchanged until the Late Middle Ages, when scientists started making ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Journal Of Physics
The ''American Journal of Physics'' is a monthly, peer-reviewed scientific journal published by the American Association of Physics Teachers and the American Institute of Physics. The editor-in-chief is Beth Parks of Colgate University."Current Frequency: Monthly, 2002; and Former Frequency varies, 1940-2001" Confirmation of Editor, ISSN, CODEN, and other relevant information. Aims and scope The focus of this journal is undergraduate and graduate level physics. The intended audience is college and university physics teachers and students. Coverage includes current research in physics, instructional laboratory equipment, laboratory demonstrations, teaching methodologies, lists of resources, and book reviews. In addition, historical, philosophical and cultural aspects of physics are also covered. According to the 2021 Journal Citation Reports from Clarivate, this journal has a 2020 impact factor of 1.022. History The former title of this journal was ''American Physics Teacher'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Absent-Minded Professor
''The Absent-Minded Professor'' is a 1961 American science fiction comedy film produced by Walt Disney Productions and based on the short story "A Situation of Gravity" by Samuel W. Taylor, originally published in the May 22, 1943 issue of ''Liberty'' magazine. The title character was based in part on Hubert Alyea, a professor emeritus of chemistry at Princeton University, who was known as "Dr. Boom" for his explosive demonstrations. Directed by Robert Stevenson, the film stars Fred MacMurray as Professor Ned Brainard, alongside Nancy Olson, Keenan Wynn, Tommy Kirk, Leon Ames, Elliott Reid, and Edward Andrews. The plot follows Brainard as he invents a substance that defies gravity, which he later exploits through various means. Released on March 16, 1961, the film was a huge success at the box office, and two years later became the first Disney film to have a sequel, '' Son of Flubber'' (1963). It was one of the first Disney films to be colorized (for the 1986 video release) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
T-symmetry
T-symmetry or time reversal symmetry is the theoretical symmetry of physical laws under the transformation of time reversal, : T: t \mapsto -t. Since the second law of thermodynamics states that entropy increases as time flows toward the future, in general, the macroscopic universe does not show symmetry under time reversal. In other words, time is said to be non-symmetric, or asymmetric, except for special equilibrium states when the second law of thermodynamics predicts the time symmetry to hold. However, quantum noninvasive measurements are predicted to violate time symmetry even in equilibrium, contrary to their classical counterparts, although this has not yet been experimentally confirmed. Time ''asymmetries'' generally are caused by one of three categories: # intrinsic to the dynamic physical law (e.g., for the weak force) # due to the initial conditions of the universe (e.g., for the second law of thermodynamics) # due to measurements (e.g., for the noninvasive measur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Super Bowl III
Super Bowl III was an American football game played on January 12, 1969 at the Orange Bowl in Miami, Florida. It was the third AFL–NFL Championship Game in professional American football, and the first to officially bear the trademark name "Super Bowl". Super Bowl III is regarded as one of the greatest upsets in both American football history and in the recorded history of sports. The 19½ points underdog American Football League (AFL) champion New York Jets defeated the National Football League (NFL) champion Baltimore Colts by a score of 16–7. The game was the first Super Bowl victory for the AFL. Before the game, many sports writers and fans believed that AFL teams were less talented than NFL clubs, and expected the Colts to defeat the Jets by a wide margin. Baltimore posted a 13–1 record in the regular season and shut out the Cleveland Browns 34–0 in the NFL Championship Game. The Jets were 11–3 in the regular season, and defeated the Oakland Raiders 27–23 in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pete Rozelle
Alvin Ray "Pete" Rozelle (; March 1, 1926 – December 6, 1996) was an American businessman and executive. Rozelle served as the commissioner of the National Football League (NFL) for nearly thirty years, from January 1960 until his retirement in November 1989. He is credited with making the NFL into one of the most successful sports leagues in the world. During his tenure, Rozelle saw the NFL grow from 12 teams to 28, oversaw the creation of large television-rights deals and the creation of ''Monday Night Football'' in 1970, oversaw the 1970 AFL–NFL merger and the creation of the Super Bowl, and helped the NFL move from a twelve-game schedule to a sixteen-game schedule. By the time of his retirement, many people considered him the most powerful commissioner in sports. He was inducted into the Pro Football Hall of Fame in 1985. Early life Born in South Gate, California, Rozelle grew up in neighboring Lynwood during the Great Depression. He graduated from Compton High School i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Super Bowl
The Super Bowl is the annual final playoff game of the National Football League (NFL) to determine the league champion. It has served as the final game of every NFL season since 1966, replacing the NFL Championship Game. Since 2022, the game is played on the second Sunday in February. Prior Super Bowls were played on Sundays in early to mid-January from 1967 to 1978, late January from 1979 to 2003, and the first Sunday of February from 2004 to 2021. Winning teams are awarded the Vince Lombardi Trophy, named for the coach who won the first two Super Bowls. Due to the NFL restricting use of its "Super Bowl" trademark, it is frequently referred to as the "big game" or other generic terms by non-sponsoring corporations. The day the game is played is often referred to as "Super Bowl Sunday" or simply "Super Sunday". The game was created as part of a 1966 merger agreement between the NFL and the competing American Football League (AFL) to have their best teams compete for a champi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kansas City Chiefs
The Kansas City Chiefs are a professional American football team based in Kansas City, Missouri. The Chiefs compete in the National Football League (NFL) as a member club of the league's American Football Conference (AFC) West division. The team was founded in 1959 as the Dallas Texans by businessman Lamar Hunt, and was a charter member of the American Football League (AFL). In spring 1963, the team relocated to Kansas City, and assumed its current name. The Chiefs joined the NFL as a result of the merger in , and the team is valued at over $3.7 billion. Hunt's son, Clark Hunt, serves as chairman and CEO. While the elder Hunt's ownership stakes passed to his widow and children after his death in 2006, Clark is the operating head of the franchise; he represents the Chiefs at all league meetings, and has ultimate authority on personnel changes. The Chiefs won three AFL championships, in 1962, 1966, and 1969, and were the second AFL team (after the New York Jets) to defeat a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Football League
The American Football League (AFL) was a major professional American football league that operated for ten seasons from 1960 until 1970, when it merged with the older National Football League (NFL), and became the American Football Conference. The upstart AFL operated in direct competition with the more established NFL throughout its existence. It was more successful than earlier rivals to the NFL with the same name, the 1926, 1936 and 1940 leagues, and the later All-America Football Conference (which existed between 1944 and 1950 but only played between 1946 and 1949). This fourth version of the AFL was the most successful, created by a number of owners who had been refused NFL expansion franchises or had minor shares of NFL franchises. The AFL's original lineup consisted of an Eastern division of the New York Titans, Boston Patriots, Buffalo Bills, and the Houston Oilers, and a Western division of the Los Angeles Chargers, Denver Broncos, Oakland Raiders, and Dallas T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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