In 1950, the United Nations created the WMO for meteorology (weather and climate), operational hydrology and related geophysical sciences. Its headquarters are in Geneva, Switzerland. The current president is Alexander Bedritsky and the current Secretary-General is Michel Jarraudwho were both elected by the 14th World Meteorological Congress in 2003.
Static mixer
A static mixer is a piece of equipment that is used to mix liquids in laboratories. It has a unique shape.
A static mixer is made up of rectangular plates twisted around at 180° so that they make a double-helix shape.
Liquids flow along the curves of the static mixer and also are separated by the smooth sides of the mixer. The mixer can also be turned clockwise, or right, and then quickly turned counter-clockwise, or left. This creates opposite currents in the liquid and mixes it more efficiently.
The static mixer can be used to mix acids and alkalis for a neutralization. It can also be used to mix two liquids that normally wouldn't mix, like oil and water (see emulsion). It separates the particles of the water and oil until they become so small that they mix.
Komárno
Komárno is a town in the southwest of Slovakia. It is an important, historical town which is famous for having the largest fortification in Europe.
The river Vah flows into the Danube at Komárno. The Danube at this point forms the border between the countries Slovakia and Hungary. The Hungarian name for the town is Komárom.
At first there was just one town, with the Danube flowing through the middle of the town. Since the end of World War I, when Czechoslovakia became a separate country from Hungary, the town has been split into two: Komárno is on the left (north) bank of the river, now in Slovakia, and Komárom is on the right (south) bank of the river, in Hungary. Komárno has a population of 37.000 and Komárom has a population of 19.600. The two towns are joined by a bridge.
People have lived in the area of Komárno for thousands of years. The first castle was built in the 10th century. In 1244 a law was made which said that every merchant who sailed a boat down the Danube past Komárno had to stop for several days in Komárno and unload all the cargo so that people could buy it if they wanted. If the merchant did not want to do this he had to pay a large duty (amount of money) to continue his journey. This law was stopped in 1751.
In the 15th century Komárno had become very important. The rulers and the court of the kingdom of Hungary often stayed there. The fortress was very powerful and they managed to fight off Turkish invaders after the Turks had already captured Esztergom and Buda. The fort was badly damaged in 1783 in an earthquake, but it was built up again because of the Napoleonic wars.
Today Komárno is a nice town to visit. There are many tourist attractions, especially the fort which is on the Hungarian side of the town (Komárom). There are also spa health centres where people can swim or bathe gently in the waters which help to make people who are ill healthy again.
Famous people who were born in Komárno are:
Komarno
Komarno (, , ) is a city in the Horodok Raion (district) of the Lviv Oblast (province) in western Ukraine. 4,000 people live there. It was founded in 1324. In the center of town is an old Polish Kostel (Catholic Church). There is also an old wooden church with ancient icons. The river Vereshytsia flows through the town.
The Hasidic dynasty of Komarno comes from this town.
Correlation
In statistics and probability theory, correlation is a way to indicate how closely related two sets of data are.
Correlation does not always mean that one causes the other. In fact, it is very possible that there is a third factor involved.
Correlation usually has one of two directions. These are positive or negative. If it is positive, then the two sets go up together. If it is negative, then one goes up while the other goes down.
Lots of different measurements of correlation are used for different situations. For example, on a scatter graph, people draw a line of best fit to show the direction of the correlation.
"Strong" and "weak" are words used to describe the strength of correlation. If there is strong correlation, then the points are all close together. If there is weak correlation, then the points are all spread apart.
There are ways of making numbers show how strong the correlation is. These measurements are called correlation coefficients. The best known is the Pearson product-moment correlation coefficient, sometimes denoted by formula_1 or its Greek equivalent formula_2. You put in data into a formula, and it gives you a number between -1 and 1. If the number is 1 or −1, then there is strong correlation. If the answer is 0, then there is no correlation. Another kind of correlation coefficient is Spearman's rank correlation coefficient.
Correlation does not always mean that one thing causes the other (causation), because there might be something else that is at play.
For example, on hot days people buy ice cream, and people also go to the beach where some are eaten by sharks. There is a correlation between ice cream sales and shark attacks (they both go up as the temperature goes up in this case). But just because ice cream sales go up does not mean ice cream sales cause (causation) more shark attacks or vice versa.
Because correlation does not imply causation, scientists, economists, etc. will test their theories by creating isolated environments where only one factor is changed (where this is possible). However, politicians, salesmen, news outlets and others often suggest that a particular correlation implies causation. This may be due to ignorance or a wish to persuade. Thus, a news report may attract attention by saying that people who consume a particular product more often have a particular health problem, implying a causation that could be actually due to something else.
Sunscreen
Sunscreen (also known as sunblock, suntan lotion, or sun cream in the United Kingdom) is a lotion, spray or other topical product that helps protect the skin from the sun's ultraviolet (UV) radiation. It reduces sunburn and other skin damage, with the goal lowering your risk of skin cancer. However, in the United States, the term suntan lotion usually means the opposite of sunscreen, and instead refers to lotion designed to moisturize and maximize UV exposure and tanning rather than block it. These are commonly called indoor tanning lotions when designed for use with tanning beds or just suntan lotion if designed for outdoor use and may or may not have SPF protection in them.
The most effective sunscreens protect against both UVB (ultraviolet radiation with wavelength between 290 and 320 nanometres), which can cause sunburn, and UVA (between 320 and 400 nanometres), which damages the skin with more long-term effects, such as premature skin aging. Most sunscreens work by containing either an organic chemical compound that absorbs ultraviolet light (such as oxybenzone) or an opaque material that reflects light (such as titanium dioxide, zinc oxide), or a combination of both. Typically, absorptive materials are referred to as chemical blocks, whereas opaque materials are mineral or physical blocks.
First Council of Nicaea
The First Council of Nicaea was held in Nicaea, in Bithynia in 325. Nicea is the city of Iznik in Turkey. The Roman Emperor Constantine I called the bishops of the Roman Empire to the first ecumenical conference of the early Christian Church. It had as most important result the first uniform Christian doctrine, called the Nicene Creed.
With the creation of the creed, a precedent was established for subsequent 'general (ecumenical) councils of Bishops' (Synods) to create statements of belief and church law. The purpose was to define unity of beliefs for the whole of Christendom.
The agenda of the synod were: