Who is the Desert Fox? Erwin Johannes Eugen Rommel, also known as the Desert Fox, was forced to lead German troops to Tobruk after Italian troops failed to drive back British forces. Although Rommel's army ended up retreating, he still...

Sedimentary, igneous, and metamorphic rocks are the stars of this interesting video produced by NASA. The rock cycle is when each of these three types of rocks transforms into another kind of rock - which happens under extreme...

This simplified explanation is an entertaining way to see how viruses reproduce in the human body. Brilliant animation and humorous commentary will keep your junior high class engaged while they observe the basics about viruses. Follow...

The BBC reports on the Indian Ocean tsunami that occurred in 2004 off the coast of Sumatra in Indonesia as a result of an earthquake. Footage of the waves and destruction around the area is shown. Maps delineate the quake's epicenter and...

Take a daring dive into the depths of a bee hive to observe how these large colonies work together to gather pollen to produce honey. These bees are busy indeed and even have their own way of communicating. Check out this video to learn...

Mr. Andersen introduces viewers to the use of a Geiger Counter. He explains the fundamental forces behind nuclear radiation and differentiates alpha, beta, and gamma radiation. Finally, he teaches how to write nuclear equations. This...

Part two in this video series on dairy farming in Florida is here for you. More details on the processes involved in getting milk from the cows, and the process of pasteurization are presented in great detail. These two videos, in...

When electric current moves through a magnetic field, a force is created that can actually power a motor. Learn how to build a simple electromagnetic motor by watching this colorful and upbeat video. This episode is the third in a series...

The collapse of the Soviet Union is retold in this illuminating video. The video includes detailed descriptions of what each of the Soviet states were demanding from Gorbachev, and the role of Boris Yeltsin in the formation of the new...

"One of nature's boldest predators," the peregrine falcon, has the fastest raw speed amongst any creature on the planet. Follow these researchers as they study how the falcon lives and moves.

The example problem is this video has a sequence of numbers that decrease by a fixed amount with each iteration, and one needs to find the 100th number in the sequence. Sal shows the listener how to find the pattern between the number...

Sal uses the formula for perimeter to show how the variables can be moved around to solve a problem. He demonstrates a few different ways to do this.

An example of writing an algebraic equation of the pattern of blocks that grows at each iteration is shown in this video. Sal shows how to find the pattern by looking at the iteration number and number of blocks. He then continues this...

Using a specific example, Sal shows how to find the equation of a tangent line to a given function at a specific point. Specifically, he solves the problem of finding the tangent line to the function f(x) = xex at x = 1. This problem...

We look at a number of different examples of functions and see what their domain is. Sal writes the domain in set notion and shows how different functions can have different input values that cause the function to be undefined.

After defining a simple function from a word problem, a short video shows how one could find the domain and the range of that function. The instruction reinforces the definitions of domain and range with a concrete example.

Are odd numbers connected to odd functions and even numbers to even functions? This video tries to clarify that connection. It also talks about functions that are neither odd nor even to give a more intuitive feeling about classifying...

In this video, Sal starts with the equation of a hyperbola by first comparing it to the equation of the circle, and ellipse. He then shows how to find the equation of the asymptotes by solving for y. He also shows a few intuitive ways to...

The equation of a circle is explored in this video by looking first at the equation of a circle with the center at the origin; then building upon that, equations of circles that are shifted off the origin.

This is the last of three well-done videos on identifying and graphing conic sections from an equation. Here, Sal shows graphing a circle, not centered at the origin, and a parabola that opens downward.

In this video, a complex number is defined and graphed on the complex plane. Sal also shows how to add, subtract, and multiply two complex numbers. He starts showing how to divide two complex numbers, but runs out of time and continues...

This video covers the differential notation dy/dx and generalizes the rule for finding the derivative of any polynomial. It also extends the notion of the derivatives covered in the Khan Academy videos, "Calculus Derivatives 2Ó and...

Sal continues where he left off with the last video, "Derivatives 1,Ó by looking at the equation y = x^2 and examining the slope of the secant line at a specific point, and again defining the limit as x approaches zero to get the slope...

By defining the formal definition of a derivative, f(x), Sal is able to find the general form of the derivate function for the example f(x) = x2. He continues to stress the importance of an intuitive understanding of derivative functions.