In which John Green explores how Spain went from being a middling European power to one of the most powerful empires on Earth, thanks to their plunder of the New World in the 16th and 17th centuries. Learn how Spain managed to destroy...

In which John Green explores how Spain went from being a middling European power to one of the most powerful empires on Earth, thanks to their plunder of the New World in the 16th and 17th centuries. Learn how Spain managed to destroy...

Co-creator of the philanthropic FEED bags, Ellen Gustafson says hunger and obesity are two sides of the same coin. In her talk, she launches The 30 Project -- a way to change how we farm and eat in the next 30 years, and solve the global...

Everyone eats, right? But how does that food get the energy to power you? In this episode of Crash Course Kids, Sabrina talks about the way energy moves, or flows, through an ecosystem and how that movement forms Food Chains! This first...

In this video Paul Andersen explains how energy can neither be created nor destroyed but may be transferred. Energy comes in many forms (including chemical, mechanical, light, electrical, and thermal). In AP Chemistry students must be...

In this video Paul Andersen explains how energy can be transferred from one system to another. In a closed system the energy can be transferred as either work or heat. Thermal energy transfer is know as energy transfer through heat. ...

Peter Ouko spent 18 years in Kamiti Prison in Kenya, sometimes locked up in a cell with 13 other grown men for 23 and a half hours a day. In a moving talk, he tells the story of how he was freed -- and his current mission with the...

New ReviewIn this math video lesson, students learn how to use substitution to solve a system of linear equations in a clear, step-by-step way. The problem presents a system along with four possible solutions, and students are asked to determine...

New ReviewIn this math video lesson, students learn how to write a system of linear inequalities from a given graph by analyzing key features of each boundary line and the shaded solution region. The modeled example begins by identifying the...

New ReviewIn this short math video, students learn how to graph a system of linear inequalities step by step using clear visuals and explanations. We begin with a quick review of how to graph a line in slope-intercept form. For the first...

New ReviewIn an era long before phones, radios, telegraphs, or even writing systems, the people of Sub-Saharan Africa had already mastered one of history's quickest and most effective long distance communication systems.

In this video I want to answer the question, what is the Rational Unified Process, RUP?

When you are trying to solve a system of equations there are three tips that I want for you to remember.

In this video we are going to cover the three different solutions you can expect from a system of linear equations. How to identify one solution, no solution and infinite many solutions.

Welcome back to the Fluctus Channel, as we explore how the M1 Abrams main battle tank is moved from base to battlefield using rail airlift and sealift. Fluctus is a website and YouTube channel dedicated to sea geeks. Whenever you are...

Welcome back to the Fluctus Channel, as we explore the evolution and employment of Gatling guns in modern air warfare, from the GAU-8 Avenger on the A-10 Warthog to the devastating firepower of the AC-130 gunship and the...

Welcome back to the Fluctus Channel, as we explore the advanced aviation systems used to battle modern wildfires, from MAFFS equipped C130 air tankers and high-altitude NASA ER2 mapping aircraft. Fluctus is a website and YouTube channel...

Powerful, portable, professional. The Electro-Voice Evolve 90 is a column loudspeaker built for large, high-energy events. With an 18" subwoofer, eight HF drivers and proprietary waveguides, it delivers 134dB of massive sound with 28Hz...

Explore the beauty of "Saturn" with our catchy video that makes learning about this ringed planet exciting and fun! Perfect for kids, this tune will spark your imagination and teach you fascinating facts about Saturn and its stunning rings.

This video is answering the question of how does hydro power work.

Singapore is a small city-state that likely isn't as well known to you as some of the other countries we've discussed before. But they've got one of the most fascinating health care systems around. It's cheap, it's pretty much universal,...

Last week we discussed the United States health care system. This week we discuss Canada's. We also take some time to bust some myths about their single payer health care system. Fight about it in the comments below.

Barbershops have long played a significant social, economic, and cultural role in African-American life. Barbershops foster both confidentiality and camaraderie, which seems like a good environment to talk to men about hypertension.

Now that we’ve set the ground rules, and the five main questions to consider, let’s look at the various plans. At the time we taped this episode (in mid February), there were ten that we could get full answers for. How they break down is...