1. When did the earliest models of air conditioners appear? Icon Ancient Egypt Icon Ancient Roman The correct answer is answer A: According to research by archaeologists and historians, the most primitive model of air conditioners appeared from ancient Egypt. To cool the indoor air and avoid the hot and dry desert climate, the ancient Egyptians hung bundles of water-soaked reeds in the windows. When the wind blows through the window, it will bring water vapor into the house. Another way of cooling the ancient Romans was that they surrounded the walls of the house with plumbing, when the water circulated, it would cool the house. Water cooling was also adopted by the medieval Persians. Their system includes wind towers and water tanks that help cool the indoor air. 2. Who came up with the first idea for an air-cooling system? Icon Michael Faraday Icon John Gorrie Icon Benjamin Franklin The correct answer is answer B: Scottish physician John Gorrie (1803-1855) Scottish physician John Gorrie (1803-1855), who gave the first idea of ​​the air-cooling system. Although the model and ideas above were never realized, in 1851, Gorrie was still awarded a patent for a machine that made ice. 3. Who invented the model of air cooling by adding salt to water as it evaporates? Icon Cornelis Drebble Icon Michael Faraday Icon Benjamin Franklin The correct answer is answer A: Beginning with the inventor Cornelis Drebble (1572-1633), he invented a model for cooling the air by adding salt to water as it evaporates. They were introduced to the then king of England, James I, but were not taken seriously. In 1758, the governor of Pennsylvania, Benjamin Franklin (1785-1788) and Professor of Chemistry John Hadley (1731-1764) at Cambridge University experimented and discovered the principle of reducing heat from evaporation. This was an important invention that laid the foundation for later air conditioners. Both Franklin and Hadley realized that the evaporation of a liquid such as alcohol or ether could lower the temperature of an object below the freezing point of water. Both men successfully experimented with evaporation to reduce the temperature of a mercury thermometer tube from 18 degrees Celsius to minus 14 degrees Celsius. By 1820, the British chemist Michael Faraday (1791-1867) made it. successfully experimented with compression and liquefaction of ammonia gas. During his experiments, he realized that evaporating liquid ammonia could cool the surrounding air, and this was one of the premise for later air conditioners. 4. Who first invented the modern air conditioner? Icon Willis Carrier Icon John Gorrie Icon Benjamin Franklin The correct answer is answer A: In 1902, Willis Carrier (1875-1950) invented a model of the air conditioner while working for the Buffalo Forge mechanical company. Willis Carrier was born in New England state (USA), from a young age, she was smart and bright. After graduating from Cornell University, Mr. Carrier worked in a heat-resistant suit. His research saves the company $40,000 per year. With this invention, Carrier is known as the father of the modern air conditioner model that we are using. However, Carrier’s air conditioning system is very large, noisy, extremely expensive and very dangerous because it uses the toxic chemical ammonia to cool the air. In 1911, Carrier continued to introduce “refrigerant formulations with reasonable humidity ratio”, this method of refrigeration is still used in some areas of the refrigeration industry. 5. Where was the Willis Carrier air conditioning system first used? Icon A movie theater Icon A printing factory Icon On the bus The correct answer is B: Willis Carrier’s air conditioning system is used in a printing factory. This system helps control the temperature and also keeps the humidity in the plant. Carrier’s principle of humidifying the air is quite simple, instead of pushing air through the heating tube, the air flowing through the tube is cooled by liquefied ammonia. 6. In what year was the Carrier-built air conditioning system first installed in a home in Minneapolis? Icon 1913 Icon 1914 Icon 1915 The correct answer is B: In 1914, a Carrier-built air conditioning system was installed for the first time in a house in Minneapolis. This machine is 2.1 meters high, 1.8 meters wide and nearly 7 meters long. But this machine has never been used because no one lives in the house. However, homeowners still have to spend more than 60,000 USD per year to maintain the entire house. 7. When was the first movie theater in the US equipped with air conditioning? Icon 1917 Icon 1918 Icon 1919 The correct answer is answer A: The household air conditioner has a height of 2.1 meters, a width of 1.8 meters and a length of nearly 7 meters. However, it has never been used because no one lives in the house but, the owner is a famous gambler who is rich and spends more than $60,000 annually on maintenance. From 1917 to 1930, the cinema was a place for people to enjoy the air cooled by air conditioning. The first movie theater in the US to be equipped with air conditioning was the New Empire Theater in Montgomery, Alabama in 1917. In that year, the Central Park Theater in Chicago also installed an air-conditioning system, which was enthusiastically received by customers. . Especially on summer days, the air conditioner is even more effective. In 1922, Carrier continued to make two breakthroughs in air conditioning. The first is that he replaces the toxic condenser ammonia with another, safer compound, dielene (dichlorethylene). 8. In 1969, the cooling system was fitted in Neil Armstrong’s spacesuit when performing a Moon walk, is it true or false? Icon It’s correct Icon Wrong The correct answer is answer A: In 1969, a cooling system was fitted in the spacesuits of Neil Armstrong and Buzz Aldrin to combat the conditions in space. These two astronauts wore them while on the Moon walk. Result Please work harder! point

About 200 km from Saigon, Bu Gia Map National Park is located at the end of the South Truong Son range. This place has a rather special geographical position, which is a transitional place from the Central Highlands to the Southern Delta. To the east of Bu Gia Map is Dak Nong province, to the northwest, it borders Cambodia. I have been to many forests and climbing mountains in Europe and America, but the tropical forests of Southeast Asia (including Vietnam) always have their own charm that is hard to resist. Nature at Bu Gia Map attracts visitors by the rusticity, of the wildest things such as fresh, cool air and clear streams. In particular, this place is also characterized by the primeval forest when there are many rare species of trees such as rosewood, red oak, and cedarwood. Visitors coming here are easily caught up in the rolling, fanciful foliage of ancient trees up to 40-50 m high. Visitors coming here are easily caught up in the rolling, fanciful foliage of the 40-50 m tall old trees. I silently watched the clouds fly alternately in the forest foliage, in the high blue sky. Stepping into the wilderness always gives you a feeling of being nourished, peaceful and elated at the same time. Here, I also learn how to exploit my senses more, feel the natural world more and more attractive. Going through the primeval forests, breathe in the fresh air created by the trees. The air given by nature will make your soul light and relaxed. Nature also always heals our troubles, doesn’t it? The habitat of the humid tropical forest is diverse. There are plants that are used by indigenous people as medicinal herbs, or used in daily life such as giant umbrella tree, mausoleum. The forest also has cool, clear streams that are filtered completely naturally through layers, layers of forest trees and rocks. With low mountainous terrain, the trails here have a moderate slope, quite easy to go. The plants intertwine with the stream create a diversity of landscapes, as well as the habitat of many animals. The biodiversity makes the forest scenery more pure and fresh. I could smell the damp vegetation and the rotten leaves slowly blending into the forest soil, giving off a pungent odor. The deeper you go into the forest, the more strange and curious you will feel. The most interesting thing is probably when being immersed in the rapids and natural lakes in the middle of the forest with the flow originating from Dak Nong province. The clear sound of the stream, the murmuring water helps your soul to be strangely peaceful. This is the time when I let myself float on the pure, blue water. Lakes and streams intertwine with the forest canopy, blending in and out, creating a feeling of friendliness and immersion as if returning to the primitive period. Not only watching the majestic scenery, I also learned about the culinary culture and traditional dishes of the S’tieng and M’nong people such as lam rice, Thuc soup, grilled chicken, stream fish, wild vegetables… Going to pick wild vegetables, collect firewood, catch fish from streams… then set up a kitchen, boil water for tree roots with a mausoleum and cook in the middle of the forest with bamboo tubes. Traditional Thuc Soup (Trau Pung) of the S’tieng includes rattan buds, bitter eggplant, spinach, wild mushrooms and stream fish. Com lam, a traditional dish typical of the cultural identity of the S’tieng people. In the S’tieng language, lam rice is called “Bien man don ka”, which means that sticky rice is cooked into rice in a bamboo tube. This is also an indispensable dish in their holidays and Tet. The S’tieng and M’nong people have a long tradition of association with the mountains and forests. Since ancient times, these ethnic groups have lived along primeval forests and depended on hunting, gathering, and shifting cultivation. Coming here, I also had the opportunity to travel on the beautiful border route. There are 2 main roads to go through Bu Gia Map, DT 741 road and Binh Phuoc province border. The difference is that these two roads can connect to form a circle embracing the forest. Bu Gia Map National Park – the green lung of the Southeast region, is definitely a great experience for anyone who loves nature. There is no phone signal or internet, where you are completely immersed in nature, listening and enjoying the sounds of the mountains. You will feel the breeze on your skin, hear the harmonious singing of birds, smell the fragrance of plants, taste the sweetness of the air… Note before the journey You must contact the managers of Bu Gia Map in advance. They will assign a guide to lead you to the desired location. Without a guide, rangers and border guards will not allow you to enter the forest. In addition, you need to prepare all the basic items when entering the forest: – Shoes with good adhesion, climbing ability, bring slippers (when not going to the forest), long socks that can be draped over pants to avoid squeezing, insects – Comfortable jungle clothes, good elasticity, swimwear for bathing – Snacks and drinks – Common medical drugs, insect repellents, extractors

About 200 km from Saigon, Bu Gia Map National Park is located at the end of the South Truong Son range. This place has a rather special geographical position, which is a transitional place from the Central Highlands to the Southern Delta. To the east of Bu Gia Map is Dak Nong province, to the northwest, it borders Cambodia. I have been to many forests and climbing mountains in Europe and America, but the tropical forests of Southeast Asia (including Vietnam) always have their own charm that is hard to resist. Nature at Bu Gia Map attracts visitors by the rusticity, of the wildest things such as fresh, cool air and clear streams. In particular, this place is also characterized by the primeval forest when there are many rare species of trees such as rosewood, red oak, and cedarwood. Visitors coming here are easily caught up in the rolling, fanciful foliage of ancient trees up to 40-50 m high. Visitors coming here are easily caught up in the rolling, fanciful foliage of the 40-50 m tall old trees. I silently watched the clouds fly alternately in the forest foliage, in the high blue sky. Stepping into the wilderness always gives you a feeling of being nourished, peaceful and elated at the same time. Here, I also learn how to exploit my senses more, feel the natural world more and more attractive. Going through the primeval forests, breathe in the fresh air created by the trees. The air given by nature will make your soul light and relaxed. Nature also always heals our troubles, doesn’t it? The habitat of the humid tropical forest is diverse. There are plants that are used by indigenous people as medicinal herbs, or used in daily life such as giant umbrella tree, mausoleum. The forest also has cool, clear streams that are filtered completely naturally through layers, layers of forest trees and rocks. With low mountainous terrain, the trails here have a moderate slope, quite easy to go. The plants intertwine with the stream create a diversity of landscapes, as well as the habitat of many animals. The biodiversity makes the forest scenery more pure and fresh. I could smell the damp vegetation and the rotten leaves slowly blending into the forest soil, giving off a pungent odor. The deeper you go into the forest, the more strange and curious you will feel. The most interesting thing is probably when being immersed in the rapids and natural lakes in the middle of the forest with the flow originating from Dak Nong province. The clear sound of the stream, the murmuring water helps your soul to be strangely peaceful. This is the time when I let myself float on the pure, blue water. Lakes and streams intertwine with the forest canopy, blending in and out, creating a feeling of friendliness and immersion as if returning to the primitive period. Not only watching the majestic scenery, I also learned about the culinary culture and traditional dishes of the S’tieng and M’nong people such as lam rice, Thuc soup, grilled chicken, stream fish, wild vegetables… Going to pick wild vegetables, collect firewood, catch fish from streams… then set up a kitchen, boil water for tree roots with a mausoleum and cook in the middle of the forest with bamboo tubes. Traditional Thuc Soup (Trau Pung) of the S’tieng includes rattan buds, bitter eggplant, spinach, wild mushrooms and stream fish. Com lam, a traditional dish typical of the cultural identity of the S’tieng people. In the S’tieng language, lam rice is called “Bien man don ka”, which means that sticky rice is cooked into rice in a bamboo tube. This is also an indispensable dish in their holidays and Tet. The S’tieng and M’nong people have a long tradition of association with the mountains and forests. Since ancient times, these ethnic groups have lived along primeval forests and depended on hunting, gathering, and shifting cultivation. Coming here, I also had the opportunity to travel on the beautiful border route. There are 2 main roads to go through Bu Gia Map, DT 741 road and Binh Phuoc province border. The difference is that these two roads can connect to form a circle embracing the forest. Bu Gia Map National Park – the green lung of the Southeast region, is definitely a great experience for anyone who loves nature. There is no phone signal or internet, where you are completely immersed in nature, listening and enjoying the sounds of the mountains. You will feel the breeze on your skin, hear the harmonious singing of birds, smell the fragrance of plants, taste the sweetness of the air… Note before the journey You must contact the managers of Bu Gia Map in advance. They will assign a guide to lead you to the desired location. Without a guide, rangers and border guards will not allow you to enter the forest. In addition, you need to prepare all the basic items when entering the forest: – Shoes with good adhesion, climbing ability, bring slippers (when not going to the forest), long socks that can be draped over pants to avoid squeezing, insects – Comfortable jungle clothes, good elasticity, swimwear for bathing – Snacks and drinks – Common medical drugs, insect repellents, extractors