This organic chemistry video tutorial explains the hybridization of atomic orbitals. It discusses how to determine the number of sigma and pi bonds in a molecule as well as determining if a carbon is sp, sp2, or sp3 hybridized. The full version of this video contains plenty of examples and practice problems.

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Multiplying negatives is a very important part of algebra. This tutorial outlines how to go about multiplying negative numbers, and demonstrates the process with examples.

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Students discuss their highlights of our (Secondary) Mathematics PGCE and why you should train to teach at the University of Brighton.

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This is a math video lesson to help you with new math, math tricks, and or simple math questions you may have.

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War in general isn’t a pleasant place to be, however, it's quite clear that there are some jobs that are simply worse than others. While some soldiers may find themselves in unfortunate positions through direct orders of command, there are other roles that people have willingly volunteered for... and then discovered exactly why it was a terrible, terrible idea. Here are some jobs throughout military history you absolutely do NOT want to volunteer for.

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From the 3rd to the 5th centuries, the Roman Empire gets divided and less stable. The Western Roman Empire considered to end in 476 with control of Italy by Odoacer.

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World History on Khan Academy: From the earliest civilizations to the modern world, geography, religion, trade, and politics have bound peoples and nations together — and torn them apart. Take a journey through time and space and discover the fascinating history behind the complex world we inhabit today.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

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In this lesson, we'll learn the key characteristics of animals and what similarities and differences exist between various kinds of non-chordates.

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The Earth is surrounded by the atmosphere, a thin gaseous layer that allows some of the sun's radiation to penetrate. To this effect, the atmosphere has greenhouse gases, whose mission is to absorb part of the sun's energy and maintain the temperature of the planet. One of the main greenhouse gases is CO2 or carbon dioxide.

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Cliffs and canyons, beaches and dunes, floodplains and river valleys, plateaus and mountains — these are all products of a restless Earth. In today’s episode we’re going to take a closer look at how landforms greatly influence how people live and derive meaning and a sense of place. From the hills and ponds we see everyday to impressive landscapes like Uluru in Australia or the Kamchatka Peninsula in Russia they all have stories to tell.

SOURCES
Petersen, et al 2011. Fundamentals of Physical Geography. Cengage
Christopherson, R.W. 2010: Elemental Geosystems. Prentice Hall
Strahler, A. 2011. Introducing Physical Geography. 5th Edition.Wiley and Sons.
Knox and Marston. 2016. Human Geography Place and Regions in a Global Context. 7th Edition. Pearson
Huggett, R.J. 2007. Fundamentals of Geomorphology. 2nd Edition. Routledge
Luhr, J.F. 2003. Earth. Dorling Kindersley.
Zurick D and Karan P.P. 1999. Himalaya Life on the Edge of the World. John Hopkins Press.
https://www.smithsonianmag.com..../history/how-hanniba
https://assets.answersingenesi....s.org/doc/articles/p
https://pubs.usgs.gov/gip/dynamic/himalaya.html
https://www.nps.gov/grca/learn..../education/upload/ge

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Learn to Play Chess - Discovered Attack | Kids Academy

The discovered check can help you win the game. It is one of the most intelligent moves in chess. This move will make your opponent come out of their comfort zone and move their king. This would block the check of your opponent, which means that your chances of doing checkmate increases and you can put the opponent’s king under threat. It is one of the most common played tactics in chess.

So, what happens in this kind of move is that when you move a piece, a piece is revealed behind it that is now attacking the king. This will force the opponent to move their king hence giving you a chance to checkmate. A discovered check is one of the most popular moves used in chess and very important to the lesson for chess for beginners. It can help you earn a lot of points and win the game.


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In which John Green teaches you about the Protestant Reformation. Prior to the Protestant Reformation, pretty much everyone in Europe was a Roman Catholic. Not to get all "great man," but Martin Luther changed all that. Martin Luther didn't like the corruption he saw in the church, especially the sale of indulgences, so he left the church and started his own. And it caught on! And it really did kind of change the world. The changes increased literacy and education, and some even say the Protestant Reformation was the beginning of Capitalism in Europe.

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Have you ever wondered why there are no dinosaurs anymore? In Extinction for Kids, you will learn why dinosaurs no longer roam the planet. You will also learn about some other species that likewise died off. Believe it or not, plants can become extinct too, and the process happens more quickly than it does for animals.

Most of the time, extinction happens over a long period of time. When certain animals can no longer reproduce, they begin to die off. Or when animals can't adapt to their changing environment, this can also lead them to extinction. In cases of mass extinction, many species of plants and animals die out very quickly. Many scientists believe that this is what happened to the dinosaurs and other plants and animals that were on the planet millions of years ago. An asteroid may have collided with the surface of the earth and caused these species to die.

Humans can also contribute to the possibility of extinction for various species through things like overhunting, destroying habitats, or introducing nonnative species to areas where they are not usually found. In fact, have you ever heard of the dodo bird? When animals like pigs and cats were introduced to the dodo bird's environment, the bird became prey to the pigs and cats. As a result, they eventually became extinct because they could not adapt quickly enough to survive.

We hope you and your student(s) enjoyed learning about how animals and plants become extinct! If you want to learn even more, head over to our website and download one of our many free lesson plans about extinction, full of activities, worksheets, and more!

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https://learnbright.org/lessons/science/fossils/

What you will learn in Extinction for Kids:
0:00 Introduction to extinction and why species go extinct
1:17 What happened to the dinosaurs and other reasons species die out
1:56 How humans can cause extinction
3:11 Animals in danger of becoming extinct
3:38 Ways to help prevent extinction
4:01 Review of the facts

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Imagine having to hide in a secret hidden room to protect yourself and your family. That's what Anne Frank and her family had to do during World War II. In this video for kids, you will learn a lot about Anne Frank, an incredible individual who endured unimaginable suffering like so many other Jewish people during this time in history.

Anne Frank was born in Germany in 1929 to Otto and Edith Frank. She also had a sister named Margot. Otto's family, who was Jewish, had lived in Germany for many generations. Because Adolph Hitler, who hated Jews, gained control of the German government, the Franks had to move to the Netherlands. For a few years, life was pretty normal, but the family was unable to escape to the United States or England before the war started in 1939 and before the war spread to the Netherlands.

Jewish people had to endure immense persecution over the next couple years. There was always a threat of being sent to concentration camps. The Frank family decided to go into hiding. Otto, his family, and some friends moved to a secret annex in 1942, when Anne was just 13 years old. They lived there for a couple years, and Anne started writing a diary about her experiences. She hoped one day to publish it as The Secret Annex and become a famous writer.

Unfortunately, Anne Frank and her family were discovered in August of 1944 and arrested. They were sent to concentration camps a month later. Anne and her sister died of typhus in March of 1945, just two months before the end of the war. Of all the individuals who lived in the secret annex, Otto was the only one to survive. Miep Gies, a woman who had hidden Anne's diary when the Franks were arrested, gave the diary to Otto, who published it under the title The Secret Annex. Anne's wish came true—she became a famous writer whose book has sold over 30 million copies and been translated into 70 languages.

We hope you and your student(s) enjoyed learning about Anne Frank! If you want even more information, head over to our website and download one of our many free lesson plans, full of activities, worksheets, and more!

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What you will learn in Who Was Anne Frank?:
0:00 Introduction to who Anne Frank was
0:40 Childhood of Anne Frank and rise of Nazi party
1:49 Living in the Netherlands and start of WWII
2:45 What Jewish people had to do near beginning of the war
3:45 The Secret Annex
4:51 Anne keeps a diary
5:21 The Franks and others discovered
6:19 War ends and publication of Anne's diary
7:27 Reflection questions

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In our Cultures of the world video we will learn about what culture means and how cultures can be very different around the world. We will learn how to appreciate the differences and how they influence our own identities. We will explore the American culture, French, Chinese, and many other cultures around the world.

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Asia: https://youtu.be/1pNBDTNVhCw
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Australia: https://youtu.be/zmon5Tv6bYU
China: https://youtu.be/q7JK5Vxf_VQ
North America: https://youtu.be/JZk6_dgA9uQ
South America: https://youtu.be/Z4iwEMbal24
Mexico: https://youtu.be/hmhLgM9uGN0

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The Buran meaning “snowstorm” in Russian was the Soviet Union’s response to NASA's space shuttle program.

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Credit:
Created by Daniel Turner

Narrator:

Mike Joseph


Music Credit

Space Station Experience by Unicorn Heads

Unlispacers! This is a new version of fun quiz challenge in Mathematics which will help you to learn faster and get better in Multiplication!

Enjoy learning Math🥰

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