Molecular dynamicsMolecular dynamics (MD) is a computer simulation method for analyzing the physical movements of atoms and molecules. The atoms and molecules are allowed to interact for a fixed period of time, giving a view of the dynamic "evolution" of the system. In the most common version, the trajectories of atoms and molecules are determined by numerically solving Newton's equations of motion for a system of interacting particles, where forces between the particles and their potential energies are often calculated using interatomic potentials or molecular mechanical force fields.
MassMass is an intrinsic property of a body. It was traditionally believed to be related to the quantity of matter in a physical body, until the discovery of the atom and particle physics. It was found that different atoms and different elementary particles, theoretically with the same amount of matter, have nonetheless different masses. Mass in modern physics has multiple definitions which are conceptually distinct, but physically equivalent.
Spin angular momentum of lightThe spin angular momentum of light (SAM) is the component of angular momentum of light that is associated with the quantum spin and the rotation between the polarization degrees of freedom of the photon. Spin is the fundamental property that distinguishes the two types of elementary particles: fermions with half-integer spins and bosons with integer spins. Photons, which are the quanta of light, have been long recognized as spin-1 gauge bosons. The polarization of the light is commonly accepted as its “intrinsic” spin degree of freedom.
Conservation movementThe conservation movement, also known as nature conservation, is a political, environmental, and social movement that seeks to manage and protect natural resources, including animal, fungus, and plant species as well as their habitat for the future. Conservationists are concerned with leaving the environment in a better state than the condition they found it in. Evidence-based conservation seeks to use high quality scientific evidence to make conservation efforts more effective.
Conservation biologyRedirect2|Biological conservation|ConservationBiology (journal)|and|Biological Conservation (journal)Biological Conservation (journal)|and|Conservation Ecology (journal)Conservation Ecology (journal)|the popular movement|Conservationism Conservation biology is the study of the conservation of nature and of Earth's biodiversity with the aim of protecting species, their habitats, and ecosystems from excessive rates of extinction and the erosion of biotic interactions.
Peace on Earth (film)Peace on Earth is a one-reel 1939 Metro-Goldwyn-Mayer cartoon short directed by Hugh Harman, about a post-apocalyptic world populated only by animals, as it is claimed in the short that human beings have gone extinct due to war. Two young squirrels ask their grandfather (voiced by Mel Blanc) on Christmas Eve who the "men" are in the lyric "Peace on Earth, good will to men." The grandfather squirrel then tells them a history of the human race, focusing on the never-ending wars men waged.
Fictitious forceA fictitious force is a force that appears to act on a mass whose motion is described using a non-inertial frame of reference, such as a linearly accelerating or rotating reference frame. It is related to Newton's second law of motion, which treats forces for just one object. Passengers in a vehicle accelerating in the forward direction may perceive they are acted upon by a force moving them into the direction of the backrest of their seats for instance.
The Jetsons Meet the FlintstonesThe Jetsons Meet the Flintstones is a 1987 animated crossover made-for-television film produced by Hanna-Barbera for syndication as part of the Hanna-Barbera Superstars 10 series. The two-hour special stars the cast of the Hanna-Barbera sitcoms The Flintstones and The Jetsons as they cross paths following a time travel experiment gone wrong. In the future, while Elroy is busy working on a time machine, George Jetson comes to Mr. Spacely's office for a serious discussion.
Broadway Melody of 1940Broadway Melody of 1940 is a 1940 MGM film musical starring Fred Astaire, Eleanor Powell and George Murphy (Astaire's first male dancing partner on film). It was directed by Norman Taurog and features music by Cole Porter, including "Begin the Beguine". The film was the fourth and final entry in MGM's "Broadway Melody" series of films, and is notable for being the only on-screen pairing of Astaire and Powell, who were considered the finest film musical dancers of their time.
Classical mechanicsClassical mechanics is a physical theory describing the motion of macroscopic objects, from projectiles to parts of machinery and astronomical objects, such as spacecraft, planets, stars, and galaxies. For objects governed by classical mechanics, if the present state is known, it is possible to predict how it will move in the future (determinism), and how it has moved in the past (reversibility). The "classical" in "classical mechanics" does not refer classical antiquity, as it might in, say, classical architecture.
LawLaw is a set of rules that are created and are enforceable by social or governmental institutions to regulate behavior, with its precise definition a matter of longstanding debate. It has been variously described as a science and as the art of justice. State-enforced laws can be made by a group legislature or by a single legislator, resulting in statutes; by the executive through decrees and regulations; or established by judges through precedent, usually in common law jurisdictions.
The Jack Benny ProgramThe Jack Benny Program, starring Jack Benny, is a radio and television comedy series, which ran for more than three decades and is generally regarded as a high-water mark in 20th-century American comedy. He played one role throughout his radio and television career, a caricature of himself as a minimally talented musician and penny-pincher who was the butt of all the jokes. The show's producer, Hilliard Marks, was the brother of Benny's wife, Mary Livingstone.
