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The Ottoman Empire This empire was founded in the end of the 13th century by Osman and reached its height of supremacy in the 16th and 17th century when it controlled almost Southeast Europe, parts of Central Europe, Western Asia, parts of Eastern Europe and the Caucasus, North Africa, and the Horn of Africa. We shall now discuss some unknown and interesting facts about this empire in the video presented. For more info visit: https://www.youtube.com/theopenbook

Christopher Columbus is credited with the discovery of America but a number of theories have been floated around this claiming that it is untrue. The video is an attempt to check on these theories and their validity. There are so many people who claim that America was discovered not by Columbus. It is not possible to go into all these theories but we shall look at some of the important archeological evidences that have been placed to dispute Columbus’s claim. For more info visit Subscribe to our Channel : https://www.youtube.com/theopenbook

Nikola Tesla Living under the shadow of Thomas Edison Tesla is lesser known but his theories have given him a special place in the field. Here we try to showcase some of the interesting facts that have come to light about Tesla. He was an electric engineer and a physicist of repute. He has over 300 patents credited to him but he became famous for developing the alternate current technology which has awide variety of uses. For more info visit Subscribe to our Channel : https://www.youtube.com/theopenbook

Economies pros and cons This video attempts to give an insight into the type of economies and their advantages and disadvantages. Before discussing types of economies it is essential for us to understand what an economy is. In broad terms economy is a framework under which activities are undertaken. Activities could be both economic and non economic. An economic activity refers to anything that allows some kind of gain monetarily. For more info Subscribe to our Channel : https://www.youtube.com/theopenbook

Pythagoras The name Pythagoras is synonymous with his theorem but there are various facets of this great mathematician that few people are aware of. This video is an attempt to bring to light some of the lesser known facts. Pythagoras was born in Samos and from a very young age he had a passion of gaining knowledge which took him to distant places. His interests were varied and math was just one of them. He was a philosopher of repute and even founded a religion named after him Pythagoreanism. According to him numbers were the elements behind the whole universe and his followers who were many also felt the same. To them numbers were akin to God. Pythagoras even felt that some people were not good enough to be told about the secret powers of the numbers. For example the numbers 7, 8 and 10 represented wisdom, justice and sanctity. Whenever they solved a theorem they would sacrifice an ox as a gift to God. This kind of belief frightened people and they even chased him out of the tow

Eclipse – Its myths and realities Both solar and lunar eclipses over the years have had people rushing to astrologers to know how it would affect them. From being a scientific occurrence this had been transformed to a religious connotation. In this video we shall explore the myths as well as the scientific rationale behind the occurrence. From early times the solar eclipse has had different stories related to it but the common thread was that the disappearance of the sun was due to it being eaten up. Each culture had its own fables while one called it the demon devouring the sun others said it was the frog, dog etc . Fear of solar eclipses still exists today. Many people around the world still see eclipses as evil omens that bring death, destruction, and disasters. For more info visit: For more info visit: https://www.youtube.com/theopenbook

Ozone is created in the atmosphere when the sun's rays split oxygen molecules into single atoms. These atoms combine with nearby oxygen to form a three-oxygen molecule, called ozone. Even as it's being made, ozone is also destroyed by sunlight and reactions involving natural compounds that contain chlorine, nitrogen, and hydrogen. Most of the earth's ozone is contained in the stratosphere, a layer of the atmosphere 10–40 km above the surface of the earth. The amount of ozone in the stratosphere is fairly constant when viewed globally. However, it changes throughout the year and from one place to another. Most of the world's ozone is created over the Tropics, and is then pushed by stratospheric winds over the rest of the planet. For more info visit: https://www.youtube.com/theopenbook

Keeping Children Safe in Cold Weather 1. Think layers. Put several layers of clothing on your child and make sure their head, neck and hands are covered. Dress babies and young children in one more layer than an adult would wear. 2. Beware clothing hazards. Scarves and hood strings can strangle smaller children so use other clothing to keep them warm. 3. Check in on warmth. Tell children to come inside if they get wet or if they’re cold. Then keep watching them and checking in. They may prefer to continue playing outside even if they are wet or cold. 4. Use sunscreen. Children and adults can still get sunburn in the winter. Sun can reflect off the snow, so apply sunscreen. 5. Install alarms. More household fires happen during the winter so make sure you have smoke and carbon monoxide alarms in your home. 6. Get equipped. Children should always wear helmets when snowboarding, skiing, sledding or playing ice hockey. Any sports equipment should be professionall

The history of the Great Wall of China began when fortifications built by various states during the Spring and Autumn (771–476 BC) and Warring States periods (475–221 BC) were connected by the first emperor of China, Qin Shi Huang, to protect his newly founded Qin dynasty (221–206 BC) against incursions by nomads from Inner Asia. The walls were built of rammed earth, constructed using forced labor, and by 212 BC ran from Gansu to the coast of southern Manchuria. Later dynasties adopted different policies towards northern frontier defense. The Han (202 BC – 220 AD), the Northern Qi (550–574), the Sui (589–618), and particularly the Ming (1369–1644) were among those that rebuilt, re-manned, and expanded the Walls, although they rarely followed Qin's routes. The Han extended the fortifications furthest to the west, the Qi built about 1,600 kilometers (990 mi) of new walls, while the Sui mobilized over a million men in their wall-building efforts. Conversely, the Tang (618–907), the

The Middle Ages though referred to as the Dark Ages did have its share of changes too. The Renaissance and Reformation took place during this time and both had far reaching repercussions in the history of the world. The English King, Henry the eighth was in fact one of the key personalities involved in this change. During the Middle Ages the Pope under the Roman Catholic Church was wielding undue power and this was disliked by the group of radical thinkers who were responsible for the Renaissance movement in Europe. Added to this was the desire of King Henry the eighth to annul his first marriage and remarry , His request to the Pope fell on deaf ears and this fuelled the movement. The Reformation was initially more of a political affair than a theological one. There were political differences between Rome and England and this was highlighted as a result of this rebellion by the king. For more info visit: https://www.youtube.com/theopenbook