If being alive on Earth were a contest, humans would win it hands down. We're like the Michael Phelps of being alive, but with 250,000 times more gold medals. Today Hank is here to tell us the specifics of why and how human population...

Paul Andersen begins with a brief description of NASA discoveries related to Mars, Mercury and water. He then explains why water is required for life. He finally uses a simulation to show you why water acts as a wonderful solvent and...

In this episode, Hank goes over Reversible Reactions, the water dissociation constant, what pH and pOH actually mean, Acids, Bases, and Neutral Substances as well as the not-so-terrifying Logarithms, strong acids, weak acids, and how to...

So, we know what materials are, but can we make new materials? Or improve the materials we already have? In this episode of Crash Course Kids, Sabrina shows us how Material Scientists are working on these two things today. Also, your...

In this video Paul Andersen explains the first step in the design process, defining and delimiting the engineering problem. Design requires a clear definition of the problem and this is done by addressing both the constraints and...

In this video Paul Andersen explains how engineers optimize the design solution. After a number of solutions have been identified engineers will test each of them against a given set of criteria. They will trade-off different...

How to Handle Conflict Crash Course Business - Soft Skills #13

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 the equation of a line parallel to a given line when the original equation is written in slope-intercept form and a point on the parallel line is provided. An exemplar solution is...

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 ReviewThis video give instruction and practice with finding the problem and solution with simple and more complex texts.

In this video, I answer two questions: what is technical debt, and what is refactoring (code refactoring)?

This video will explain the process you go through to conduct an Acid/Base Titration using a Strong Acid and a Strong Base. We also show you an easy way to do acid/base titration calculations!

Learn about titration, an important analytical technique in chemistry! This video explains how to determine the concentration of a solution using volumetric analysis. We will explain what a titration is and then give you an easy formula...

This video describes the dilution process and explains how to use the dilution formula to solve dilution problems!

In this video we are going to explore how to solve rational equations given an easy example and a more difficult example with extraneous solutions.

In this video I am going to work through a common mistake I see students make when solving rational equations.

This video explains how to check if a fraction is a solution to a rational equation (0:24). The presenter demonstrates the process by plugging in a fractional solution back into the original equation, emphasizing the importance of...

In this video I am going to work through simplifying complex fractions by going through multiple examples.

This video explains how to solve three different square root equations (0:00). Brian McLogan demonstrates how the placement of the radical impacts the steps to solve the equation and the final solution (0:12). He covers isolating the...

What does it look like when we have an equation with one solution vs one with two solutions.

What a cool experience!

In this video students will observe that regardless of the type of change that occurs in heating, cooling, or mixing, the total weight of matter is conserved. A hands-on demonstration helps students set-up their own activity to prove...