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Our muscles work miracles. We can run long distances and perform complex coordinative movements. Our muscles need energy to do so. Adenosine triphosphate, ATP for short, is essential in the provision of energy to muscles. Because without ATP, muscles cannot contract. This film explains how the ATP gets to and feeds the muscles.

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Allergies are an overreaction by the body. Harmless substances are seen as enemies and attacked. An allergic reaction occurs. The immune system reacts to these substances, known as allergens, in the same way as it would to germs, and forms antibodies. At the end of the film is a glossary with a summary of the contents.

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Die Film Flat bietet über 8.000 rechtssichere Unterrichtsfilme für alle Schulformen, Fächer und Altersklassen. Das Angebot umfasst Lehrfilme, Dokumentationen und Spielfilme. Lehrkräfte können die Videos streamen, herunterladen und mit ihren Schülerinnen und Schülern teilen.

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Food production always has an impact on the environment. This film examines the impact of beef production on the one hand and vegetable production on the other. The video explains what the CO2 equivalent, ecological footprint and ecological backpack are and calculates them as well as water consumption.

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In order to understand the formation of wind, the film explains the circumstances under which air pressure gradients occur and how air always flows from high pressure to low pressure areas. Human respiration, the land-sea wind system on the coasts and the corridor wind system in cities are used as examples.

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The world population is growing faster and faster. The film shows which factors determine in which parts of the world population density increases or decreases. Birth and death rates play a role, but it is shown that prosperity, political and social security and the economy are also important factors.

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This film looks at random experiments with exactly two possible outcomes. Such random experiments are called Bernoulli processes, after the Swiss mathematician. Simple examples explain the basics of calculating such processes. Elements such as the Bernoulli chain, the "Galton board" and Pascal´s triangle are introduced.

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For a sample to be truly representative for an extrapolation or a forecast, it must be randomly selected. The film uses examples from everyday life to show that random evaluation can always lead to errors. Accordingly, forecasts are never really safe predictions, but always only of high probability.

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This film is all about the relationship between the circumference and the diameter of circles. Using the example of a bicycle speedometer, we first introduce the number pi and the formula for working out the circumference of a circle. We then show how we get to the formula for working out the surface area of circles.

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It is relatively easy to solve mixed quadratic equations by applying the binomial formulas backwards. The film shows how to recognize that a quadratic addition is necessary by using the equivalent transformation, the conversion and the root extraction. The video describes the procedure step by step.

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This video describes the circular flow of income between households and businesses. Using examples and illustrative animations, the circular flow is presented in a very simplified model which clearly shows the exchange relations. Money and goods are two opposing flows between households and businesses.

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By needs, we mean the feeling of lacking something and wanting to remedy that lack. In economics, we usually look at the demand, namely those needs that are specifically asked for on the market and that people are willing to pay for. Examples and animations clarify what goods are and how they serve to satisfy our needs.

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Expressionism is an art movement that was established in the late 19th century. In the first half of the 20th century, it had many supporters, especially in Germany. This video presents the most important German painters of this movement and gives an overview of the first independent art movement of the 20th century.

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There are different ways in which a volcano can develop. The film explains the influence of plate movements on this process. It illustrates the structure of the earth from the earth´s core, mantle, and crust and takes a closer look at the so-called hot spots, where magma accumulates over a long period of time.

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Impressionism was an art movement started by French painters in the second half of the 19th century. In contrast to the strictness and elaboration of classicism, painters like Monet, Pissarro and Renoir chose bold strokes and aggregations of single colour dots. This video gives an introduction to the most important Impressionist artists.

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Accompanying the melody by means of chords makes the music of the Western world multifaceted and exciting. The film introduces the major and minor triads, as well as the diminished and augmented consonance. It shows in which ways they can be rearranged and how the newly arranged chords sound in each case.

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Harmony theory includes rules for the major-minor tonal system. The film explains how conducting triads are created, for what reason they are called "steps", which of them are major triads and which are minor triads, and that the seventh is a diminished triad. Cadence and authentic cadence are explained.

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The clarinet is a wind instrument, more precisely: one of the reed instruments. The film explains its construction and how it works. It shows how the different high notes are produced in the clarinet reed thanks to the reed, the air flow produced by the player and the operation of the keys for the holes with the hands.

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In the recorder, which belongs to the category of labial pipes in the aerophone genre, the sound is produced by making the air column vibrate. The film explains the structure and function of the instrument and shows how tones of different pitch are produced on it. Other instruments also work in this way.

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The subject of this film is the trumpet. It belongs to the genus of aerophones and to the category of brass instruments. It is played by causing the air column in the trumpet tube to vibrate. The film explains the structure of the instrument and the way in which the player sets the air in the tube in motion with his lips.

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The space between two notes that are played at the same time or one after another is called an interval. This video presents the prefect and imperfect intervals and the major and minor intervals within an octave, with their names and characteristics. We also take a closer look at compound intervals.

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The time signature of a piece of music is defined by two numbers written one above the other at the beginning of the stave. This film uses the 4/4, 3/4 and 6/8 time signatures to explain their differences and how they work. We also look a closer look at the stresses, the upbeats, and the conductor´s job.

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You can determine the value of a note by looking at the stem, the body, and the flags. With these aids, whole notes, half notes, quarter notes, eighth notes and sixteenth notes can be represented. The film also explains the function of the bars, dottings and slurs as well as the rests and their signs.

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Where does lightning come from and how is thunder produced? The film explores these questions and explains the physical conditions under which a thunderstorm occurs. It also explains how Benjamin Franklin studied lightning in the 18th century and demonstrates how to calculate the distance of a thunderstorm.

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This video explains the El Niño climate anomaly. It illustrates the effects of this widescale change in water and air flows and sheds light on the main causes of their occurrence. We also provide discussion approaches about whether increasing global warming is also influencing this natural climate anomaly.

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Twice a day, the water at the sea coast reaches its highest and lowest level, which is due to the gravitational pull of the moon. The film describes the different water levels at low and high tide and explains the terms. The video also takes a closer look at the spring tide and explains how it occurs.

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The subjects of this video are the weather and the different climate zones of the earth. Sunshine, clouds, rain, wind, heat, and cold – we call all this weather. In meteorology, however, "weather" is defined as the perceptible state of the atmosphere at a certain time and place on the Earth´s surface.

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We encounter sodium in various forms in many places in everyday life, including the kitchen. The film introduces sodium and sodium hydroxide, points out their differences, and demonstrates their material properties by means of experiments. The very different uses of the reactive element are also shown.

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There are different groups of substances to which substances are assigned according to their characteristic properties. The film shows what these properties are, namely the state of aggregation, the melting or boiling temperature, metallic sheen, hardness, density, solubility and finally conductivity.

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Sulfur was already used 5000 years before Christ to bleach textiles and as a disinfectant. As one of the most reactive elements, sulfur consists of atoms arranged in a ring. The video introduces the different forms of sulfur and shows in several experiments how it behaves and reacts with other elements.

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