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INTRODUCTION: This course introduces to you the theory of repulsion field, the field that is believed to act as "the scaffolding" that props up the Universe. The repulsion field, that is produced by bodies of rich-neutron matter at the centers of black holes, stars, and even planets like the Earth, also takes part in the development of earthquakes, volcano eruptions, El Nino, La Nina, etc. By joining this course, you will find out a lot of answers to many mysterious natural phenomena.

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INTRODUCTION: This course helps answer many interesting questions like what are the major causes of flight turbulence, why do birds and air planes fly in arrow-like shape, why do space shuttles easily fly upwards, will air planes save fuel if they fly from the west to the east above the equator, how can helicopters fly forwards. It is all about aerodymanics, the balance of force, and it is an interesting course that is worth discovering.

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INTRODUCTION: This course includes answers to many interesting questions like where do tropical storms and tornadoes come from, how to create a small tropical storm in laboratory, how do tropical storms and tornadoes move, how do tides work in reality, what causes trade winds and what causes corrosion of one river bank and silt of the other river bank. By joining this course, you can easily find out the answers to these questions.

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INTRODUCTION: This course helps high school and college students improve their mathematical problem solving skills. This course covers mathematical topics such as integration by parts and integration by substitution, derivatives, trigonometry, function investigation, coordinate geometry, simultaneous equations, logarithm, exponential, etc. This course is very helpful for students who are in preparation for college admission tests.

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INTRODUCTION: This course, free tutoring service in physics, provides high school and college students with physics problem solving skills. This course covers two main topics of high school and college physics, direct current problems and alternating current problems. By joining this course, students can learn basic steps to work out direct current problems and alternating current problems that they may come across in college admission tests.

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INTRODUCTION: This course, free tutoring service in chemistry, provides high school and college students with chemistry problem solving skills. This cours covers to main topics of high school and college chemistry, inorganic chemistry and organic chemistry problems. By joing this course, students can learn basic steps to to work out inorganic chemistry and organic chemistry problems that thay may come across in college admission tests.