The international community is a phrase used in geopolitics and international relations to refer to a broad group of people and governments of the world. It does not refer literally to all nations or states in the world. The term is typically used to imply the existence of a common point of view towards such matters as specific issues of human rights. Activists, politicians and commentators often use the term in calling for action to be taken; e.g., action against what is in their opinion political repression in a target country.

The term is commonly used to imply legitimacy and consensus for a point of view on a disputed issue; e.g., to enhance the credibility of a majority vote in the United Nations General Assembly.

Noam Chomsky alleges that the use of the term is used to refer to the United States and its allies and client states, as well as allies in the media of those states. The scholar and academic Martin Jacques says: “We all know what is meant by the term ‘international community’, don’t we? It’s the west, of course, nothing more, nothing less. Using the term ‘international community’ is a way of dignifying the west, of globalising it, of making it sound more respectable, more neutral and high-faluting.”

Environmental issues are harmful effects of human activity on the biophysical environment. Environmental protection is a practice of protecting the natural environment on individual, organizational or governmental levels, for the benefit of both the environment and humans. Environmentalism, a social and environmental movement, addresses environmental issues through advocacy, education and activism.

The carbon dioxide equivalent of greenhouse gases (GHG) in the atmosphere has already exceeded 400 parts per million (NOAA) (with total “long-term” GHG exceeding 455 parts per million) (Intergovernmental Panel on Climate Change Report). This level is considered a tipping point. “The amount of greenhouse gas in the atmosphere is already above the threshold that can potentially cause dangerous climate change. We are already at risk of many areas of pollution…It’s not next year or next decade, it’s now.” The UN Office for the Coordination of Humanitarian Affairs (OCHA) has stated “Climate change is not just a distant future threat. It is the main driver behind rising humanitarian needs and we are seeing its impact. The number of people affected and the damages inflicted by extreme weather has been unprecedented.” Further, OCHA has stated:

Climate disasters are on the rise. Around 70 percent of disasters are now climate related – up from around 50 percent from two decades ago.

These disasters take a heavier human toll and come with a higher price tag. In the last decade, 2.4 billion people were affected by climate related disasters, compared to 1.7 billion in the previous decade. The cost of responding to disasters has risen tenfold between 1992 and 2008.

Destructive sudden heavy rains, intense tropical storms, repeated flooding and droughts are likely to increase, as will the vulnerability of local communities in the absence of strong concerted action.

A hot air balloon is a lighter than air aircraft consisting of a bag, called an envelope, which contains heated air. Suspended beneath is a gondola or wicker basket (in some long-distance or high-altitude balloons, a capsule), which carries passengers and (usually) a source of heat, in most cases an open flame. The heated air inside the envelope makes it buoyant since it has a lower density than the colder air outside the envelope. As with all aircraft, hot air balloons cannot fly beyond the atmosphere. Unlike gas balloons, the envelope does not have to be sealed at the bottom, since the air near the bottom of the envelope is at the same pressure as the surrounding air. In modern sport balloons the envelope is generally made from nylon fabric and the inlet of the balloon (closest to the burner flame) is made from a fire resistant material such as Nomex. Modern balloons have been made in all kinds of shapes, such as rocket ships and the shapes of various commercial products, though the traditional shape is used for most non-commercial, and many commercial, applications.

The hot air balloon is the first successful human-carrying flight technology. The first untethered manned hot air balloon flight was performed by Jean-François Pilâtre de Rozier and François Laurent d’Arlandes on November 21, 1783, in Paris, France, in a balloon created by the Montgolfier brothers. The first hot-air balloon flown in the Americas was launched from the Walnut Street Jail in Philadelphia on January 9, 1793 by the French aeronaut Jean Pierre Blanchard. Hot air balloons that can be propelled through the air rather than simply drifting with the wind are known as thermal airships.

The French brothers Joseph-Michel and Jacques-Étienne Montgolfier developed a hot air balloon in Annonay, Ardeche, France, and demonstrated it publicly on September 19, 1783, making an unmanned flight lasting 10 minutes. After experimenting with unmanned balloons and flights with animals, the first balloon flight with humans aboard, a tethered flight, performed on or around October 15, 1783, by Jean-Francois Pilatre de Rozier who made at least one tethered flight from the yard of the Reveillon workshop in the Faubourg Saint-Antoine. Later that same day, Pilatre de Rozier became the second human to ascend into the air, reaching an altitude of 26 m (85 ft), the length of the tether. The first free flight with human passengers was made a few weeks later, on November 21, 1783.King Louis XVI had originally decreed that condemned criminals would be the first pilots, but de Rozier, along with Marquis François d’Arlandes, petitioned successfully for the honor. The first military use of a hot air balloon happened in 1794 during the battle of Fleurus, when the French used the balloon l’Entreprenant for observation.

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The term mountaineering describes the sport of mountain climbing. While some scholars identify mountaineering-related activities as climbing rock and ice and trekking up mountains, others are also adding backpacking, hiking, skiing, via ferrata and wilderness activities, and still others state that mountaineering activities also include indoor climbing, sport climbing and bouldering.However, to most of the scholars, the term mountaineering is understood as climbing which now refers to adventure climbing or sports climbing and trekking hill walking in ‘exotic’ places.Hiking in the mountains can also be a simple form of mountaineering when it involves scrambling, or short stretches of the more basic grades of rock climbing, as well as crossing glaciers.

While mountaineering began as attempts to reach the highest point of unclimbed big mountains it has branched into specializations that address different aspects of the mountain and consists of three areas: rock-craft, snow-craft, and skiing, depending on whether the route chosen is over rock, snow or ice. All require experience, athletic ability, and technical knowledge to maintain safety.

Mountaineering is often called Alpinism, especially in European languages, which implies climbing routes with minimal equipment in high and often snow and ice-covered mountains such as the Alps, where technical difficulties frequently exceed environmental and physical challenges. A mountaineer who pursues this more technical and minimalist style of mountain climbing is sometimes called an Alpinist, although use of the term may vary between countries and eras. The word “alpinism” was born in the 19th century to refer to climbing for the purpose of enjoying climbing itself as a sport or recreation, distinct from merely climbing while hunting or as a religious pilgrimage that had been done generally at that time.

A soap bubble is an extremely thin film of soapy water enclosing air that forms a hollow sphere with an iridescent surface. Soap bubbles usually last for only a few seconds before bursting, either on their own or on contact with another object. They are often used for children’s enjoyment, but they are also used in artistic performances. Assembling several bubbles results in foam.

When light shines onto a bubble it appears to change colour. Unlike those seen in a rainbow, which arise from differential refraction, the colours seen in a soap bubble arise from interference of light reflecting off the front and back surfaces of the thin soap film. Depending on the thickness of the film, different colours interfere constructively and destructively.

Soap bubbles are physical examples of the complex mathematical problem of minimal surface. They will assume the shape of least surface area possible containing a given volume. A true minimal surface is more properly illustrated by a soap film, which has equal pressure on inside as outside, hence is a surface with zero mean curvature. A soap bubble is a closed soap film: due to the difference in outside and inside pressure, it is a surface of constant mean curvature.

While it has been known since 1884 that a spherical soap bubble is the least-area way of enclosing a given volume of air (a theorem of H. A. Schwarz), it was not until 2000 that it was proven that two merged soap bubbles provide the optimum way of enclosing two given volumes of air of different size with the least surface area. This has been dubbed the double bubble conjecture.

Because of these qualities, soap bubbles films have been used with practical problem solving application. Structural engineer Frei Otto used soap bubble films to determine the geometry of a sheet of least surface area that spreads between several points, and translated this geometry into revolutionary tensile roof structures. A famous example is his West German Pavilion at Expo 67 in Montreal.

When two bubbles merge, they adopt a shape which makes the sum of their surface areas as small as possible, compatible with the volume of air each bubble encloses. If the bubbles are of equal size, their common wall is flat. If they aren’t the same size, their common wall bulges into the larger bubble, since the smaller one has a higher internal pressure than the larger one, as predicted by the Young–Laplace equation.

At a point where three or more bubbles meet, they sort themselves out so that only three bubble walls meet along a line. Since the surface tension is the same in each of the three surfaces, the three angles between them must be equal to 120°. Only four bubble walls can meet at a point, with the lines where triplets of bubble walls meet separated by cos−1(−1/3) ≈ 109.47°. All these rules, known as Plateau’s laws, determine how a foam is built from bubbles.

A recipe is a set of instructions that describes how to prepare or make something, especially a culinary dish. It is also used in medicine or in information technology . A doctor will usually begin a prescription with recipe, Latin for take, usually abbreviated to Rx or an equivalent symbol.

The earliest known written recipes date from approximately 1600 BC and come from an Akkadian tablet from southern Babylonia. There are also ancient Egyptian hieroglyphics depicting the preparation of food.

Many ancient Greek recipes are known. Mithaecus’s cookbook was an early one, but most of it has been lost; Athenaeus quotes one short recipe in his Deipnosophistae. Athenaeus mentions many other cookbooks, all of them lost.

Roman recipes are known starting in the 2nd century BCE with Cato the Elder’s De Agri Cultura. Many authors of this period described eastern Mediterranean cooking in Greek and in Latin.Some Punic recipes are known in Greek and Latin translation.

The large collection of recipes De re coquinaria, conventionally titled Apicius, appeared in the 4th or 5th century and is the only complete surviving cookbook from the classical world. It lists the courses served in a meal as Gustatio (appetizer), Primae Mensae (main course) and Secundae Mensae (dessert).Each recipe begins with the Latin command “Take…,” “Recipe….”

Arabic recipes are documented starting in the 10th century; see al-Warraq and al-Baghdadi.

The earliest recipe in Persian dates from the 14th century. Several recipes have been survived from the time of Safavids, including Karnameh (1521) by Mohammad Ali Bavarchi, which includes the cooking instruction of more than 130 different dishes and pastries, and Madat-ol-Hayat (1597) by Nurollah Ashpaz. Recipe books from the Qajar period are numerous, the most notable being Khorak-ha-ye Irani by prince Nader Mirza.

King Richard II of England commissioned a recipe book called Forme of Cury in 1390, and around the same time, another book was published entitled Curye on Inglish, “cury” meaning cooking. Both books give an impression of how food for the noble classes was prepared and served in England at that time. The luxurious taste of the aristocracy in the Early Modern Period brought with it the start of what can be called the modern recipe book. By the 15th century, numerous manuscripts were appearing detailing the recipes of the day. Many of these manuscripts give very good information and record the re-discovery of many herbs and spices including coriander, parsley, basil and rosemary, many of which had been brought back from the Crusades.

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